Question

Productivity in Northern Hemisphere Middle Latitudes Nutrients Sunlight Phytoplankton F S O D J M A M J A N Month

Answer 1

13 : In the and winter months the nutrient concentration is highest for the year. This is the time of the year when cooling Suspace ocean water Sinks, creating mose o less continuous convection and mining with nutrient rich ocean water from below: 14:- The Sunlight curve through winter into spring as the sun rises higher and the daily period of day light lengthens in the middle latitudes sky: The increased sunlight and existing high nutrient concentration cause the productivity, evidenced by the phytoplankton concentration to .rapidly vibe in late winter and early spring . This drastic change in productivity is referred as algal bloom 15:- After the occurence described in 'Cuer 14, the phytoplankton concentration rapidly decreases Even though the amount of sunlight continues to increase , the phy to plonkton chonge occurs because of the abrupt reduction in the nutrient concentration. This reduction comes about as phyto plonkton , through photosynthesis, combine nutrients with CO2 and water to form osganic compounds. The dramatic phytoplankton population growth. depletes the nutrient concentration and leads to the inevitable reduction of phytoplankton 16 : Because of low nutsient concentration during the rest of spring into late Summer , the booductivity remains low until the ocean surface layer begins cooling associated with the reduction of incoming sunlight. The cooling and the strengthing of surface winds this time of year cause mining of ocean water to depths where ocean waters are nutrient rich. This typically causes a jump in productivity although modest combosed to algall bloom , for several weeks. The subsequent desoben in productivity following the fall bloom arises from a decrease th Sunlight

Question 17 is incomplete as figure 1 is not provided.

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