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16. When was the last time we had as little ice as we have today?

16. When was the last time we had as little ice as we have today?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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Exercises for Weather & Climate Reconstructing Past Climate Many of the physical mechanisms producing cli- mate change act over long time periods and are, therefore, richer in 180 during glacial advances, when water moves from oceans to continental glaciers. The shells of ocean microorganisms produced during these periods preserve the higher 180 ratios. This method provides an estimate of global ice volume (Figure 16-9). Ice cores from Greenland not evident in the relatively short instrumental climate record encompassing approximately the last 150 years. To uncover the details of past climate we must reconstruct the and Antarctica also preserve evidence of past climate or factors that influence climate: air bubbles trapped in the climate record using proxy data. Such reconstruction relies on the sensitivity of certain phenomena to climate. Plant and animal species, for example, respond to certain climate ice can reveal past concentrations of greenhouse gases that influence the energy budget. conditions, and their thresholds and their fossil record can indicate the presence of these conditions. Ocean fossils and ice cores provide evidence of long- 16. When was the last time we had as little ice as we have today? term climatic change. Ocean fossils and ice cores provide evidence of long- term climatic change. For example, sci- entists have used the ratio of two oxygen isotopes, 180 and 160 (usually called 8180), as evidence of climatic change. 17. Scientists examining paleoclimate records often explore how trends in one variable sometimes precede those in a Since 1°0 evaporates more readily than 180, oceans are correlated variable. Examine Figure 16-9 and determine Global Ocean core Northern Hemisphere Carbon dioxide ice volume 8180 summer insolation concentration 1 -1 5 4 3 450 500 550 200 250 300 20 20
Transcribed Image Text:Exercises for Weather & Climate Reconstructing Past Climate Many of the physical mechanisms producing cli- mate change act over long time periods and are, therefore, richer in 180 during glacial advances, when water moves from oceans to continental glaciers. The shells of ocean microorganisms produced during these periods preserve the higher 180 ratios. This method provides an estimate of global ice volume (Figure 16-9). Ice cores from Greenland not evident in the relatively short instrumental climate record encompassing approximately the last 150 years. To uncover the details of past climate we must reconstruct the and Antarctica also preserve evidence of past climate or factors that influence climate: air bubbles trapped in the climate record using proxy data. Such reconstruction relies on the sensitivity of certain phenomena to climate. Plant and animal species, for example, respond to certain climate ice can reveal past concentrations of greenhouse gases that influence the energy budget. conditions, and their thresholds and their fossil record can indicate the presence of these conditions. Ocean fossils and ice cores provide evidence of long- 16. When was the last time we had as little ice as we have today? term climatic change. Ocean fossils and ice cores provide evidence of long- term climatic change. For example, sci- entists have used the ratio of two oxygen isotopes, 180 and 160 (usually called 8180), as evidence of climatic change. 17. Scientists examining paleoclimate records often explore how trends in one variable sometimes precede those in a Since 1°0 evaporates more readily than 180, oceans are correlated variable. Examine Figure 16-9 and determine Global Ocean core Northern Hemisphere Carbon dioxide ice volume 8180 summer insolation concentration 1 -1 5 4 3 450 500 550 200 250 300 20 20
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