Aquatic Sciences Meeting, Albuquerque 2001
| CS09 Climate Change, Interannual/Interdecadal Variation and Global Change |
| Date: Wednesday, February 14, 2001, Time: 4:15:00 PM |
| Location: Ruidoso/Pecos |
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| Tian, R, C, Memorial University of Newfoundland, St. John's, Canada, rtian@morgan.ucs.mun.ca |
| Deibel, D, , Memorial University of Newfoundland, St. John's, Canada, ddeibel@morgan.ucs.mun.ca |
| Thompson, R, , Memorial University of Newfoundland, St. John's, Canada, rthompson@morgan.ucs.mun.ca |
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| MODELING OF CLIMATE FORCING ON COLD-SEA ECOSYSTEMS : APPLICATION IN CONCEPTION BAY, NEWFOUDLAND |
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| We have developed a prognostic, one-dimensional physical-biological model to study climate impacts on marine ecosystems in cold seas. The physical model is based on the Mellor-Yamata level 2.5 turbulence closure scheme (Princeton Ocean Model). Climatic forcings are air temperature,sea surface pressure, wind, humidity, cloudiness and precipitation, which determine the air-sea heat and momentum fluxes. Tide, ice cover, upwelling and convection also are parameterized. The biological model consists of ten state variables spanning the herbivorous food chain (nitrate, large diatom phytoplankton, mesozooplankton and large sinking particles) and the microbial food web (bacteria, ammonium, picophytoplankton, microzooplankton, DOC and suspended detritus). The model was applied to Conception Bay (Newfoundland) with physical and biological data collected during the COPE program (Cold Ocean Productivity Experiment) from 1986 to 1990. Different timing, duration and amplitude of spring phytoplankton blooms were observed. The bloom was earlier and of short-period in 1986, later and of long-duration in 1988 and of intermediate length in 1990. Based on observed climate data, the model successfully reproduced the observed patterns in these different years. The model revealed strong correlation between the NAO index (North Atlantic Oscillation) and primary production and microbial food web activity. |
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