Loading...
Please wait, while we are loading the content...
Similar Documents
A coupled ocean general circulation, biogeochemical, and radiative model of the global oceans: seasonal distributions of ocean chlorophyll and nutrients
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gregg, Watson W. |
| Copyright Year | 2000 |
| Description | A coupled ocean general circulation, biogeochemical, and radiative model was constructed to evaluate and understand the nature of seasonal variability of chlorophyll and nutrients in the global oceans. Biogeochemical processes in the model are determined from the influences of circulation and turbulence dynamics, irradiance availability. and the interactions among three functional phytoplankton groups (diatoms. chlorophytes, and picoplankton) and three nutrients (nitrate, ammonium, and silicate). Basin scale (greater than 1000 km) model chlorophyll results are in overall agreement with CZCS pigments in many global regions. Seasonal variability observed in the CZCS is also represented in the model. Synoptic scale (100-1000 km) comparisons of imagery are generally in conformance although occasional departures are apparent. Model nitrate distributions agree with in situ data, including seasonal dynamics, except for the equatorial Atlantic. The overall agreement of the model with satellite and in situ data sources indicates that the model dynamics offer a reasonably realistic simulation of phytoplankton and nutrient dynamics on synoptic scales. This is especially true given that initial conditions are homogenous chlorophyll fields. The success of the model in producing a reasonable representation of chlorophyll and nutrient distributions and seasonal variability in the global oceans is attributed to the application of a generalized, processes-driven approach as opposed to regional parameterization and the existence of multiple phytoplankton groups with different physiological and physical properties. These factors enable the model to simultaneously represent many aspects of the great diversity of physical, biological, chemical, and radiative environments encountered in the global oceans. |
| File Size | 2824467 |
| File Format | |
| Language | English |
| Publisher Date | 2000-09-01 |
| Access Restriction | Open |
| Subject Keyword | Oceanography Oceans Nutrition Silicates Irradiance Coastal Zone Color Scanner Chlorophylls Atmospheric General Circulation Models Ammonium Compounds Biogeochemistry Annual Variations Pigments Phytoplankton Mathematical Models Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
