海洋生物过程在海洋吸收大气二氧化碳中的作用

THE ROLE OF MARINE BIOLOGICAL PRO-CESSES IN THE OCEANIC UPTAKE OF ATMOSPHERIC CARBON DIOXIDE

中文关键词:  水块混合层模式  碳循环  生物泵

英文关键词:Parcel-mixed layer model  Carbon cy cle  Biolo gical pump

中文摘要:

      使用一个包括浮游生物(植物、动物和细菌)和无生命氮(有机碎片、溶解有机氮、硝酸盐和铵)的食物网来描述发生在海洋上层的生物过程.并将该生物模式分别用在佛罗里达海峡的一个固定位置和从佛罗里达海峡(24°N,80°W)流经挪威海(68°N,10°E)(扩展湾流体系,EGSS)的一个水块中,研究了海洋中上述的生物过程对水块吸收大气二氧化碳的影响.水块模式的结果十分明显地表明了海洋中的水华季,比包括浮游植物-浮游动物-硝酸盐体系得到的峰陡,结果更合理.扩展湾流体系中平均净初级生产力为43gCm^-2a^-1,小于观测值.模拟的总碱度,总二氧化碳和二氧化碳分压落在观测值的范围内,在水块吸收大气CO₂的总量中生物泵的作用约占16%.

英文摘要:

      A simple food web,including plankton(phytoplankton,zooplankt on and bacteria) and non-living nitrogen (detritus,dissolved organic nitro gen,nit rate and am monium),is used to describe the biological processes taking placing in the upper layer of the ocean.This biological model is respectively applied in a fixed position and a parcel of water moving from the Strait of Florida (24°N,80°W) to the Norwegian Sea (68°N,10°E) in the Extended Gulf Stream System (EGSS) to investigate the influence of the biological processes on the uptake of atmospheric carbon dioxide by the parcel.The results from the parcel model apparently gives the spring bloom,in which the peak is sharper than that from the model including phytoplankton-zooplnakt on and nitrate.The resutls are more reasonable.A mean net primary production of 43g Cm^-2a^-1is obtained,which is smaller than the observed one.The simulated total alkalinity,total carbon dioxide and p CO₂ are in the range of observations.The contribution of biological pumpis about 16% of the amount of carbon dioxide taken up by the parcel.