ISLSCP Initiative II | Related Pages |
|---|
|
ISLSCP Initiative II Home General Data Overview Carbon Data Overview |
|
ISLSCP Initiative II |
|
Carbon Data
Net Primary Production (NPP) is an important component of the carbon cycle and, among the pools and fluxes that make up the cycle, it is one of the steps that are most accessible to field measurement. While easier than some other steps to measure, direct measurement of NPP is tedious and not practical for large areas and so models are generally used to study the carbon cycle at a global scale. Nevertheless these models require field measurements of NPP for parameterization, calibration and validation. Most NPP data are for relatively small field plots that cannot represent the 0.5 x 0.5 grid cells that are commonly used in global scale models. Furthermore, technical difficulties generally restrict NPP measurements to aboveground parts and sometimes do not even include all components of aboveground NPP. Thus direct inter-comparison between field data obtained in different studies and coarse resolution model outputs can be misleading.
Data Provider: Stephen D. Prince, Daolan Zheng
 Data Files (ISLSCP II Disc #1) |
 Data Set Documentation |
 Image Viewing Tutorial |
All of the files in the ISLSCP Initiative II data collection are in the ASCII, or text format. The original data file gppdi_gridded_npp_hd.csv has a total of 2336 rows and 8 columns separated by a single comma. Both numerical and text fields are included.
The ISLSCP II staff have taken the original data cells and mapped them onto a global grid. There are two files mapped at 0.5 x 0.5 degrees called gridded_anpp_map_hd.asc and gridded_totnpp_map_hd.asc, and they contain the mapped above ground and total NPP, respectively. There are two files additional mapped at 1 x 1 degrees (the pixels were averaged from the half degree map files) called gridded_anpp_map_1d.asc and gridded_totnpp_map_1d.asc, and they contain the mapped above ground and total NPP, respectively.
All fo the data files have been PKZip compressed.
Related Pages:
ISLSCP Initiative II Home
General Data Overview
Carbon Data Overview
GPPDI Gridded NPP
Revision Date: February 25, 2003