Popular in Geology
Popular in Geology
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This 3 page Class Notes was uploaded by Monica Huang on Sunday April 5, 2015. The Class Notes belongs to Geol370 at San Francisco State University taught by Dr.Sklar in Fall. Since its upload, it has received 147 views. For similar materials see Geology in Geology at San Francisco State University.
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Date Created: 04/05/15
Notes The GRACE mission and how it works GRACE Gravity Recovery and Climate Experiment measures Earth39s gravity eld Gravity anomalies indirectly estimate groundwater storage change Limitation of GRACE can detect terrestrial water storage changes in 200000 km2 and larger regions GRACE Gravity Recovery and Climate Experiment measures Earth39s gravity eld Gravity anomalies indirectly estimate groundwater storage change Trend mmyr Volume lost km3 GRACE Total Water Storage 37 313 Snow 2 17 Surface Water 9 76 Soil Moisture 2 17 Groundwater 24 203 0 In the 78 month period analyzed the water stored in the combined SacramentoSan Joaquin River Basin decreased by over 31 km3 or nearly the volume of Lake Mead Nearly twothirds of this or roughly 20 km3 came from changes in groundwater storage primarily from the Central Valley Groundwater storage changes in the SacramentoSan Joaquin River Basins Estimating groundwater storage changes What are the Causes of Drought 1 Ocean amp atmospheric circulation patterns 2 Land and ocean temperatures 3 3 Soil moisture content response to 1 amp 2 Less soil moisture translates to 0 Less ET 0 Less condensation to clouds Less precipitation from clouds 0 Less soil moisture Primer on Climate De nitions Weatherstate of the atmosphere at any given time and location 0 includes individual storm events Climate state of the weather that can be expected months years or longer into the future 0 climate is a function of the atmospheric circulation patterns topography solar radiation and ocean circulation patterns What is Causing the Current Drought Is the RRR natural Or is it caused by climate change Is the RRR natural 0 Yes West Paci c Warm Pool precursor to El Nino has a played a leading role in causing the RRR Wang et al 2014 0 Yes quotinternal atmospheric variabilityquot has also played a role Or is it caused by climate change 0 Not exactly See above 0 However Swain et al 2014 GCMs simulations indicate that the human emission of GHG has quotvery likely tripled the likelihood of experiencing largescale atmospheric conditions similar to those observed in 2013quot 0 many questions remain Uncertainty in the GCMs Take home point 0 the emerging science of attributing extreme weather events to humancaused climate change is very challenging
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