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Data Request Details

This page is the first of several that allow you to construct a data request to extract climate data. It allows you to enter a name and description of your data request. Enter text that will allow you and other users to quickly understand, broadly, what data has been requested and that will distinguish this request from any other requests in the same data collection. The page also allows you to select the dataset that you wish to extract data from. After you have filled in the required details on the page, you can press “Next” to proceed to the next page, in which you will further specify the data that you would like, or you can press “Save Draft” to save the data request and return to it at a later time.

Dataset

The datasets available have been generated from the NSW and ACT Regional Climate Modelling (NARCliM) project. Two datasets are available, comprising output from two sets of Regional Climate Model simulations:

  1. Ensemble of 12 GCM-forced simulations for the periods 1990-2009, 2020-2039 and 2060-2079
  2. Ensemble of 3 reanalysis-forced simulations for the period 1950-2009


Select Data Type

The NARCliM dataset contains data from climate model simulations that cover the whole of Australia at a horizontal resolution of approximately 50km and data from simulations that cover southeast Australia at a horizontal resolution of approximately 10km. This page allows you to select from the two domains and resolutions (10km and 50km).

This page also allows you to select the type of data that you wish to receive. Select “Gridded data” to obtain data values on a regular latitude-longitude grid covering your region of interest. Select “Site-specific data” if you require data values for specific point locations rather than on a grid.

Note that you can press “Previous” to return to the previous page to reconsider your selection of dataset.



Select Simulations

The NARCliM project has downscaled four Global Climate Models (GCMs), MIROC, ECHAM, CCCMA and CSIRO Mk3.0, using three different configurations of the WRF Regional Climate Model (RCM), designated "R1", "R2" and "R3". A reanalysis has also been downscaled with each of these WRF configurations, which are effectively three different RCMs. Therefore each simulation is a GCM (or reanalysis) - RCM combination (for example, "ECHAM5 + WRF R1"). This page also allows you to select the simulations that you wish to source data from. You can select a single simulation, multiple simulations or all simulations by clicking on the check boxes on the left-hand side of the table on the page.



Select Region

This page allows you to select the region of your data request. You can either do this using the map provided or by entering minimum and maximum latitudes and longitudes (in decimal degrees) defining a rectangular region. If you do both, the selection entered using the map will take precedence over the lat/long entered. Data values will be provided on a regular latitude-longitude grid for the region selected. The portal calculates data for this regular grid from the data values outputted by the model, which are on a different, irregular, grid. You can select how data values are calculated for the regular grid from the values for the model grid by selecting an interpolation method at the top of the page.

Interpolation method

You can select how data values are calculated for the regular grid from the values for the model grid by selecting an interpolation method. These include the bilinear method, which calculates values for each gridpoint in the output grid from the four surrounding model gridpoints. As an alternative, users can select the “nearest neighbour” method, whereby each gridpoint in the output grid is assigned the data values for the nearest model gridpoint. The latter method will tend to preserve the spatial and temporal variability of the model data, but the output may have spatial discontinuities not present in the model data. The former method will result in more spatially continuous data, but will tend to smooth out the spatial and temporal variability and extremes in the model data.

Using the map to select the region of interest

The dashed line on the map shows the boundary of the NARCliM model domain. You must select a region of interest that lies entirely within this boundary. If you do not, the region that you select will either be adjusted so that it does lie entirely within the boundary or you will be asked to reselect your region of interest. To select a region, draw a polygon on the map. This is done by pressing the middle button in the top-right-hand corner of the map and clicking the locations of the vertices of the polygon on the map. Double-click on the final vertex of the polygon to complete it. Note that you can only request data for a single region in one data request - if you draw a second polygon, it will replace your previous selection. You can adjust the shape of the polygon that you have drawn by clicking on the left-hand button in the top-right-hand corner of the map and dragging the edges of the polygon. If you wish to start again, press the “Delete features entered on map” button.

Click on the lower-most blue symbol in the top-left-hand corner to zoom in and out. The upper-most blue symbol in the top-left-hand corner allows you to move the map to north, east, south and west. Alternatively, you can use the hand button in the top-right-hand corner to drag the map over the region of interest. The blue “plus” symbol on the right-hand edge of the map can be used to visualise additional features on the map.

Note that gridded data will always be provided on a regular latitude-longitude grid of points covering a region that is rectangular in latitude-longitude space. This rectangular region will include the region of interest that you select. However data values within the rectangular region but outside your regions of interest will be assigned a missing data value.



Select Sites

This page allows you to select the site for your data. You can make your selection using the map provided or by entering pairs of latitude-longitude coordinates into the form provided. Data values will be returned for all sites selected using both methods. You can select how the point location values are calculated from the values for the model grid by selecting an interpolation method at the top of the page.

Interpolation method

You can select how data values for the selected sites are calculated from the values for the model grid by selecting an interpolation method. These include the bilinear method, which calculates values for each site from the four surrounding model gridpoints. As an alternative, users can select the “nearest neighbour” method, whereby each site is assigned the data values for the nearest model gridpoint. The latter method will tend to preserve the temporal variability of the model data, but will not account for the displacement between the site and model gridpoints. The former method will account for this displacement, but will tend to smooth out the temporal variability and extremes in the model data.

Using the map to select the sites of interest

To select a set of sites, press the middle button in the top-right-hand corner of the map and click the locations of the sites on the map. You can move any of the sites that you have selected by clicking on the left-hand button in the top-right-hand corner of the map and then clicking on and dragging the site. If you wish to start again, press the “Delete features entered on map” button. The map has some additional features to assist you in selection your region of interest. Click on the lower-most blue symbol in the top-left-hand corner to zoom in and out. The upper-most blue symbol in the top-left-hand corner allows you to move the map to north, east, south and west. Alternatively, you can use the hand button in the top-right-hand corner to drag the map over the region of interest. The blue “plus” symbol on the right-hand edge of the map can be used to visualise additional features on the map. Note that the site selection map shows the boundary of the spatial domain of the Regional Climate Model simulations that you have selected as a black dotted line. You cannot select sites that fall outside this boundary.

Enter matched longitudes and latitudes of selected sites

To select a set of sites, enter the longitudes and latitudes values in the boxes. Values should be comma-separated and have units of decimal degrees. Locations west of Greenwich should be denoted with a negative longitude value and locations south of the equator should be denoted with a negative latitude value.



Select Time Period

This page allows you to select the time periods of your data. You can select a single time period or multiple time periods by clicking on the check boxes at the top of the page. You must also select the temporal resolution at which you would like data returned using the radio buttons at the bottom of the page.

Temporal resolution

The climate variables from the simulations have been processed into monthly and daily values. You must choose one of these temporal resolutions.



Select Variables

This page allows you to select the climate variables that are of interest to you. You can select a single variable or multiple variables by clicking on the check boxes on the left-hand side of the table on the page. For each variable, the units that the data will be returned in can be selected using the drop-down menus on the right-hand side of the table.

Available climate variables

Mean surface air temperature (tasmean)
The mean temperature of the air 2m above the surface
Note: There are some unrealistic spatial discontinuities in the daily datasets over the ocean (see the NARCliM Data Quality Assurance Summary for more information)
Available units: °C or Kelvin

Precipitation accumulation (pracc_fl)
The amount of precipitation accumulated at the surface over the selected unit of time (month or day)
Available units: kg/m2 (equivalent to mm)

Precipitation accumulation - bias corrected (pracc_bc)
As precipitation amount (pracc_fl), only bias corrected towards precipitation observations using the method described by NARCliM Technical Note 3
Note: There are some unrealistic spatial discontinuities in this dataset in some remote inland areas of the Northern Territory, Queensland, South Australia and Western Australia due to a lack of precipitation observations available for bias correction (see the NARCliM Data Quality Assurance Summary for more information)
Available units: kg/m2 (equivalent to mm)

Mean surface pressure (psmean)
The mean atmospheric pressure at the surface
Note:Values are for the topographic surface, not for sea level
Available units: Pa

Mean near-surface wind speed (wssmean)
The mean velocity of the air 10m above the surface
Available units: m/s

Mean surface specific humidity (hussmean)
The mean ratio of the mass of water vapour to the total mass of air 2m above the surface
Note: There are some unrealistic spatial discontinuities in the daily datasets over the ocean (see the NARCliM Data Quality Assurance Summary for more information)
Available units: g/kg

Mean soil moisture content (mrsomean)
The mean amount of water in the 2m of soil beneath the surface
Note: See Koster et al. (2009) for more information on the representation of soil moisture in models
Available units: kg/m2 (equivalent to mm)

Mean downward shortwave radiation (rsdsmean)
The mean flux of incoming shortwave (solar) radiation at the surface
Available units: W/m2

Mean downward longwave radiation (rldsmean)
The mean flux of incoming longwave radiation at the surface
Available units: W/m2

Mean upward longwave radiation (rlusmean)
The mean flux of outgoing longwave radiation at the surface
Available units: W/m2

Mean sea surface temperature (sstmean)
The mean surface temperature of the sea
Note: There are some unrealistic spatial discontinuities in the daily datasets over the ocean for the MIROC3.2 simulations (see the NARCliM Data Quality Assurance Summary for more information)
Available units: °C or Kelvin



Select Output Format

This is the final page in the series of pages used to define a data request. It allows you to select the file format that you would like you data outputted in. At present, only a limited number of file formats are available. After you have selected a file format, you can press [Next] to proceed to the next page, which allows you to review your entire data request.

Output format

At present, gridded data are only available as ASCII Grid files and site-specific data are only available as CSV (Comma Separated Variable) files. ASCII Grid files can be read by GIS packages. The projection for the files is a regular latitude-longitude geographic projection and the datum is WGS84. CSV files are readable by most text editors and spreadsheet packages (e.g. Microsoft Excel). The CSV format used by the data portal that resembles that used by the Australian Bureau of Meteorology to distribute site-specific observation data.



Draft Request Summary

This page allows you to review an entire data request. If you the owner of the request, you can edit any part of it by clicking on the appropriate title. Pressing the “Get Data” button will convert the draft request into a completed request and submit the request for processing.

 < Back to main help screen


Service Homepage

The page gives an overview of how to use the NSW Climate Data Portal to access data from the NARCliM Regional Climate Model simulations.

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Log in

This page allows you to log in to the NSW Climate Data Portal. Once you are logged in, you will be able to access data.

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Register

This page allows you to register as a user of the NSW Climate Data Portal. You need to register to obtain a password for the portal.

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Notices

Notices for users of the NSW Climate Data Portal are displayed here.

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Terms and Conditions

Read the terms and conditions for usage of the NSW Climate Data Portal here. You must agree to the terms and conditions before being given access to the portal.

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Data Request Details

This page is the first of several that allow you to construct a data request to extract data. You are required to enter an informative name and description of your data request. Then, select the NARCliM dataset from which you wish to extract data:

  1. Ensemble of 12 GCM-forced simulations for the periods 1990-2009, 2020-2039 and 2060-2079
  2. Ensemble of 3 reanalysis-forced simulations for the period 1950-2009

After you have filled in the required details on the page, you can press "Next" to proceed to the next page, in which you will further specify the data that you would like, or you can press "Save Draft" to save the data request and return to it at a later time.

See help page


Select Data Type

Select from the two different domains for which NARCliM data is available:

  1. The whole of Australia at a horizontal resolution of approximately 50km
  2. Southeast Australia at a horizontal resolution of approximately 10km

Then, select the type of data:

  1. Gridded: the data is transformed from the irregular grid used by the Regional Climate Model onto a regular geographic grid. Gridded data is provided in ASCII Grid format, which is ArcGIS compatible
  2. Site-specific: the data is provided for a specific point, rather than on a grid, in CSV format

After you have filled in the required details on the page, you can press "Next" to proceed to the next page, in which you will further specify the data that you would like, or you can press "Save Draft" to save the data request and return to it at a later time.

See help page


Select Simulations

Use this page to select which NARCliM Regional Climate Model simulations you wish to extract data from. If you have chosen to extract data from GCM-forced simulations, data from 12 different simulations of the 1990-2009, 2020-2039 and 2060-2079 periods are available. If you have chosen to extract data from reanalysis-forced simulations, data from 3 different simulations of the 1950-1990 period are available.

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Select Region/Sites

Select the region or sites that you wish to extract data for. First, you must choose the interpolation method. Then, select a region or sites using either the map provided or by entering latitudes and longitudes (in decimal degrees) into the form provided. Note that a selection entered using the map will take precedence over a selection entered using the form.

See help page for region selection See help page for site selection


Map Selection

Mark the region or sites that you wish to extract data for on the map. Alternatively, use the form at the bottom of the page to enter latitude and longitude coordinates of region or sites.

See help page for region selection See help page for site selection


Select Time Period

Use this page to select the time periods that you wish to extract data for. If you have chosen to extract data from GCM-forced simulations, data for the 1990-2009, 2020-2039 and 2060-2079 periods are available. You can select a single time period or multiple time periods. If you have chosen to extract data from reanalysis-forced simulations, data for the 1950-1990 period are available. You must also select the temporal resolution (daily or monthly) at which you would like data returned.

See help page


Select Variables

You can select a single variable or multiple variables. For each variable, the units that the data will be returned in can also be selected. For a detailed description of the variables, click on the help button below.

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Output Format

At present, gridded data are available in ASCII Grid format, which is ArcGIS compatible, and site-specific data is available in CSV (Comma Separated Variable) format.

See help page


Draft Request Summary

This is a summary of your request. If you are the owner of the request, you can edit any part of it by clicking on the appropriate title. This will take you back to that step in the data request process. Pressing the “Get Data” button will prepare the request for submission. On pressing this button you will be returned to the data request listing in the Data Collection and you will be able to submit the summarised data request for processing from there.

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Browse Public Collections

This page lists all of the Data Collections that users have chosen to make public. These comprise one or more data requests. Use the links in the table to examine collections of data requests assembled by other users.

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Manage My Collections

A Data Collection is a folder that stores individual data requests. This page allows you to edit and access your Data Collections. By clicking on the link for a collection, you can view and edit the description of the collection and access the data requests within it.

You can create new, empty, collections by pressing on the "Start a Data Collection" button at the bottom of the page. We recommend that you keep the number of collections that you own to a minimum and populate each of your collections with multiple data requests. A collection may correspond to an individual project, for example.

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Start a Data Collection

A Data Collection is a folder that stores your data requests. To start a new Data Collection you need to first use this page to enter a name and description for the collection. Once this is done, you will be able to populate the collection with data requests. We recommend that you keep the number of collections that you own to a minimum and populate each of your collections with multiple data requests. A collection may correspond to an individual project, for example.

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About Collection

A Data Collection is like a folder for data requests

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Edit a Data Collection

Use this page to update the name and/or description of your Data Collection. Please note that changes that you make to the collection description will be used to modify a description of the collection that may be visible to other users of the data portal. You should therefore make sure that the edited collection description is a good description of the collection. Note, however, that a description of the temporal and spatial coverage of the data request will be automatically generated for you by the portal service.

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Public Requests

A Public Request is visible to all users of the data portal.

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Private Requests

A Private Request is only visible to you and the data portal administrator.

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Dataset

You can choose between two different types of NARCliM data.

  1. Data downscaled from GCMs for the periods 1990-2009, 2020-2039 and 2060-2079. These are the basis of the NARCliM projections.
  2. Data downscaled from a "reanalysis" for the 1950-2009 period. A reanalysis is a blend of observations and model simulations that is a complete, but coarse-resolution, representation of the atmosphere in the past.
See help page


Interpolation Method

You must choose how the data portal will calculate data values for the region/sites that you will select. Two interpolation methods are available:

  1. Bilinear: interpolates to each output gridpoint/site from the surrounding four model gridpoints
  2. Nearest Neighbour: assigns data for the nearest model gridpoint to each output gridpoint/site
See help page for region selection See help page for site selection


Temporal Resolutions

The climate variables from the simulations have been processed into monthly and daily values. You must choose one of these temporal resolutions.

See help page


Output Format

At present, gridded data are available in ASCII Grid format, which is ArcGIS compatible, and site-specific data is available in CSV (Comma Separated Variable) format.

See help page