L3
讲座
1. What is the main topic of the lecture?
Ways to reduce the growth of algae in lakes that are warming
The mapping of the world’s lakes using satellite technology
Research into global trends in lake temperatures
Methods used to measure lake depth and surface water temperature
2. What limitation of heat-sensing satellites does the professor mention?
The satellites do not detect ice-covered lakes.
The satellites do not detect lakes under a certain size.
The satellites are very expensive.
The satellites’ accuracy is affected by cloud cover.
3. Based on the lecture, in what ways is the 2015 study unique?（多选题）
It included long-term data from lakes in northern and southern latitudes.
It combined temperature measurements that were taken directly and remotely.
It was the first study to include data from shallow, ice-free lakes.
It measured the level of carbon dioxide in each lake in the study.
4. What is one finding of the 2015 study?
There was less wind near lakes when they were covered with ice.
Algae blooms in ice-free lakes have decreased over the past 25 years.
Air temperature has a much greater effect on lake warming than other factors do.
Ice-covered lakes are warming more quickly than ice-free lakes are.
5. What does the professor emphasize about increases in algae growth?
They are easier to detect from satellites than through field studies.
They rarely occur in deep lakes that are stratified.
They lead to higher amounts of heat-trapping gases in the atmosphere.
Technology is under development to reduce their frequency.
6. At the end of the lecture, what opinion does the professor express about the study?
The researchers should have included more lakes in the study.
The results of the study can be interpreted in a number of ways.
Some of the data used for the study were out-of-date.
The study’s findings indicate a troublesome trend.
