SimUText 2018-2019 File Go Tools Help Install SimUText SimUText 2018-2019 Sectio
ID: 151401 • Letter: S
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SimUText 2018-2019 File Go Tools Help Install SimUText SimUText 2018-2019 Section 2: Detecting Climate Change Climate Change NOTESQUESTIONS 20/21 Y CI Q2.18. Which of the following techniques is least likely to improve your ability to detect a trend in a climate data set? Decreasing the length of the data set by using data just from recent years Focusing on regional averages instead of local observations Analyzing temperature anomalies instead of absolute values Using more accurate instruments and techniques to collect data 45 Q2.19. Climatologists have sought evidence of climate change in many components of the climate system. Which of the following statements has the least empirical support? Surface temperatures have increased since 1850. Arctic sea ice, glaciers, and ice sheets have declined over the past 50 years. Globally, total precipitation has increased dramatically since 1850 Global mean sea level has risen significantly since 1880. 47 Q2.20. Which of the following statements about proxy reconstructions is false? Proxy reconstructions focus on how temperatures varied before the advent of thermometers Tree-ring reconstructions assume trees grow faster when it is warm and wet.Explanation / Answer
Please find the answers below:
Answer 18: Chioce 1 (climate refers to the average change in the weather conditions over a long period of time at a geographical area. Thus, decreasing the time for analysis of change in weather conditions will impair the data about climate change over time)
Answer 19: Choice 2 (the exact amount and quantization can be performed for levels of precipiation, surface and atmospheric temperatures as well as global temperatures, but not for the volume of glaciers of ice, hence representing the least empirical data in nature, only qualitative in nature)
Answer 20: Choice 4 (proxy reconstruction refers to empirically choosing some parameters which are affected by the climate over a long period of time and thus represent as indicators of climate change in a given geographical area over a long period of time. Due to their potency to get affected by many abiotic and biotic factors other than climate change alone, there remains much controversy about the proxy reconstructions)
Answer 21: Choice 4 (as a result of global increase in temperature, the polar ice melts gradually thus increasing the total water volume in the oceans.)
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