数据说明
Ocean Net Primary Production (NPP)-standard VGPM
上传时间:2019-05-22 14:09:20 浏览次数:作者与来源:admin
SeaWIFS
Net primary production is the amount of photosynthetically fixed carbon available to the first heterotrophic level and, as such, is the relevant metric for addressing environmental questions ranging from trophic energy transfer to the influence of biological processes on carbon definition cycling (Lindeman 1942).
Unit: mg C/m2/day
Resolution:  9km pixel, monthly
Duration: Sep. 1997 to Dec. 2007.
Source: SeaWiFS.
Version:
Processing: Original monthly mean products are shown.

For standard-VGPM:
The VGPM is a "chlorophyll-based" model that estimate NPP from chlorophyll using a temperature-dependent description of chlorophyll-specific photosynthetic efficiency.
NPP = Chla × Pbopt × day length × [0.66125 × PAR / ( PAR + 4.1 )] × Zeu
(1)
 
where Pbopt is the maximum carbon fixation rate within a water column (mg C· mg Chla-1·h-1), and is a function of sea surface temperature in the VGPM model (Equation (2)). PAR is the sea surface photosynthetically active radiation intensity (Enistien·m-2·d-1). Chla and Zeu are the sea surface chlorophyll-a concentration (mg·m-3) and euphotic layer depth (m), respectively.
if SST < -10℃, Pbopt=0;
else if SST < -1℃, Pbopt=1.13;
else if SST > 28.5℃, Pbopt=4;
else Pbopt= 1.2956 + 2.749e-1×SST + 6.17e-2×pow(SST,2) - 2.05e-2×pow(SST, 3)       + 2.462e-3×pow(SST,4) - 1.348e-4×pow(SST,5) + 3.4132e-6×pow(SST,6) - 3.27e-8×pow(SST,7)
(2)
 
where SST is the sea surface temperature (℃).
Known issues
It is worth noting that the products here are mainly used to estimate the NPP of the global ocean. When estimating the NPP of a regional area, it is necessary to use the measured NPP data to verify the applicability of the products presented here.


All the contents of this page are quoted from Oregon State University. All project documentation and related publications can be found at the website: http://www.science.oregonstate.edu/ocean.productivity


MODIS

Net primary production is the amount of photosynthetically fixed carbon available to the first heterotrophic level and, as such, is the relevant metric for addressing environmental questions ranging from trophic energy transfer to the influence of biological processes on carbon definition cycling (Lindeman 1942).
Unit: mg C/m2/day
Resolution:  9km pixel, monthly
Duration: Jul. 2002 to on-going.
Source: MODIS.
Version:
Processing: Original monthly mean products are shown.

For standard-VGPM:
The VGPM is a "chlorophyll-based" model that estimate NPP from chlorophyll using a temperature-dependent description of chlorophyll-specific photosynthetic efficiency.
NPP = Chla × Pbopt × day length × [0.66125 × PAR / ( PAR + 4.1 )] × Zeu
(1)
 
where Pbopt is the maximum carbon fixation rate within a water column (mg C· mg Chla-1·h-1), and is a function of sea surface temperature in the VGPM model (Equation (2)). PAR is the sea surface photosynthetically active radiation intensity (Enistien·m-2·d-1). Chla and Zeu are the sea surface chlorophyll-a concentration (mg·m-3) and euphotic layer depth (m), respectively.
if SST < -10℃, Pbopt=0;
else if SST < -1℃, Pbopt=1.13;
else if SST > 28.5℃, Pbopt=4;
else Pbopt= 1.2956 + 2.749e-1×SST + 6.17e-2×pow(SST,2) - 2.05e-2×pow(SST, 3)       + 2.462e-3×pow(SST,4) - 1.348e-4×pow(SST,5) + 3.4132e-6×pow(SST,6) - 3.27e-8×pow(SST,7)
(2)
 
where SST is the sea surface temperature (℃).
Known issues
It is worth noting that the products here are mainly used to estimate the NPP of the global ocean. When estimating the NPP of a regional area, it is necessary to use the measured NPP data to verify the applicability of the products presented here.


All the contents of this page are quoted fromOregon State University. All project
documentation and related publications can be found at the website:http://www.science.oregonstate.edu/ocean.productivity.


VIIRS

Net primary production is the amount of photosynthetically fixed carbon available to the first heterotrophic level and, as such, is the relevant metric for addressing environmental questions ranging from trophic energy transfer to the influence of biological processes on carbon definition cycling (Lindeman 1942).
Unit: mg C/m2/day
Resolution:  9km pixel, monthly
Duration: Feb. 2012 to on-going.
Source: VIIRS.
Version:
Processing: Original monthly mean products are shown.

For standard-VGPM:
The VGPM is a "chlorophyll-based" model that estimate NPP from chlorophyll using a temperature-dependent description of chlorophyll-specific photosynthetic efficiency.

 
NPP = Chla × Pbopt × day length × [0.66125 × PAR / ( PAR + 4.1 )] × Zeu
(1)
 
where Pbopt is the maximum carbon fixation rate within a water column (mg C· mg Chla-1·h-1), and is a function of sea surface temperature in the VGPM model (Equation (2)). PAR is the sea surface photosynthetically active radiation intensity (Enistien·m-2·d-1). Chla and Zeu are the sea surface chlorophyll-a concentration (mg·m-3) and euphotic layer depth (m), respectively.
if SST < -10℃, Pbopt=0;
else if SST < -1℃, Pbopt=1.13;
else if SST > 28.5℃, Pbopt=4;
else Pbopt= 1.2956 + 2.749e-1×SST + 6.17e-2×pow(SST,2) - 2.05e-2×pow(SST, 3)       + 2.462e-3×pow(SST,4) - 1.348e-4×pow(SST,5) + 3.4132e-6×pow(SST,6) - 3.27e-8×pow(SST,7)
(2)
 
where SST is the sea surface temperature (℃).
Known issues
It is worth noting that the products here are mainly used to estimate the NPP of the global ocean. When estimating the NPP of a regional area, it is necessary to use the measured NPP data to verify the applicability of the products presented here.


All the contents of this page are quoted from Oregon State University. All project
documentation and related publications can be found at the website:http://www.science.oregonstate.edu/ocean.productivity.