[請益] 關於TPO24 Lake Water 那篇有疑問
看板TOEFL_iBT (TOEFL_iBT托福)作者findinglouis (謝man)時間13年前 (2012/11/02 12:42)推噓0(0推 0噓 4→)留言4則, 2人參與討論串1/1
A given lake’s residence time is by no means a fixed quantity. It depends on
the rate at which water enters the lake, and that depends on the rainfall and
the evaporation rate. Climatic change (the result of global warming?) is
dramatically affecting the residence times of some lakes in northwestern
Ontario, Canada. In the period 1970 to 1986, rainfall in the area decreased
from 1,000 millimeters to 650 millimeters per annum, while above-average
temperatures speeded up the evapotranspiration rate (the rate at which water
is lost to the atmosphere through evaporation and the processes of plant
life).
The result has been that the residence time of one of the lakes increased
from 5 to 18 years during the study period. The slowing down of water renewal
leads to a chain of further consequences; it causes dissolved chemicals to
become increasingly concentrated, and this, in turn, has a marked effect on
all living things in the lake.
想請問!!
這篇文章一開始強調說Volumn 越大, 水越深 就會水停留的時間越長
為啥這段感覺有矛盾
說天氣改變 蒸發率變高 降雨量變小
會導致停留時間變長??!!(所的residence time)
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