At the top of this table is a link to the same data in a simple comma-separated text format, suitable for import into a spreadsheet or other data analysis software. All daily data for selected years are returned as a single (long) table, formatted for display in the browser window. Daily data from the nearest 1 km x 1 km Daymet grid cell are extracted from the database and formatted as a table with one column for each Daymet variable and one row for each day. These coordinates are used to access the Daymet database of daily-interpolated surface weather variables. A routine is executed that translates the (lon, lat) coordinates into projected Daymet (x,y) coordinates. The Single Pixel Data Extraction Tool allows users to enter a single geographic point by latitude and longitude in decimal degrees. URBAN GRIDDED NOTEBOOK ARCHIVEDaymet data can be downloaded from 1) the ORNL Distributed Active Archive Center (DAAC) search and order tools () or directly from the DAAC FTP site () and 2) the Single Pixel Tool and THREDDS (Thematic Real-time Environmental Data Services) Data Server. Data are available on a daily time step at a 1-km x 1-km spatial resolution in Lambert Conformal Conic projection more » with a spatial extent that covers the conterminous United States, Mexico, and Southern Canada as meteorological station density allows. The prior product (Version 1) only covered from 1980-2008. The current data product (Version 2) covers the period Januto Decem. More information: Presenter: Ranjeet Devarakonda Environmental Sciences Division Oak Ridge National Laboratory (ORNL) Daymet: Daily Surface Weather Data and Climatological Summaries provides gridded estimates of daily weather parameters for North America, including daily continuous surfaces of minimum and maximum temperature, precipitation occurrence and amount, humidity, shortwave radiation, snow water equivalent, and day length. Periodic updates to the continental data set will be implemented as new years of surface observations become available. MAST-DC is developing several ways to select and distribute the Daymet data: ftp download, single-pixel extraction, and access through THREDDS (Thematic Real-time Environmental Distributed Data Services) Data Server (TDS). Input data requirements for the conterminous US, Mexico, and Canada for 1980 - 2008 have been used to produce the Daymet product for these areas the data will be released in Fall more » 2010. Daymet domain to include Canada (south of 52N) and Mexico. We are providing a high-quality gridded surface weather product over North America for input to NACP process modeling studies by expanding on the conterminous U.S. One approach that has been developed to overcome this obstacle is Daymet, a numerical method for producing gridded surfaces of subdaily temperature (daily maximum and minimum temperature), and daily precipitation, humidity, and radiation over large regions of complex terrain, using daily surface weather observations and an accurate elevation grid as input. One common obstacle to model implementation over continental scale regions is the difficulty of obtaining the relevant surface weather observations from in situ networks, and producing spatially interpolated (gridded) surfaces of the necessary weather fields at the appropriate spatial and temporal resolution. Carbon dynamics and flux estimates from process models depend strongly on daily and subdaily weather conditions. A core requirement for many ecosystem modeling approaches is surface weather fields, including temperature, precipitation, humidity, and incident solar radiation.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |