Geomorphology Weekly Notes 10-1.htm
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!-- Created from PDF via Acrobat SaveAsXML --> <!-- Mapping table version: 28-February-2003 --> <HTML> <HEAD> <META name="dc.title" content="Caldera - Large volcanic dome basin - filled with water = caldera lake" > <META name="dc.date" content="2009-08-13T11:39-04:00" > <META name="dc.date.modified" content="2009-08-13T11:39:03-04:00" > <META name="generator" content="Adobe Acrobat Exchange-Pro 7.8" > </HEAD> <BODY bgcolor=white text=black link=blue vlink=purple alink=fushia > <DIV class="Sect" ><DIV ><P align="justify" ><FONT size="+1" color="#000000"></B>Caldera - Large volcanic dome basin - filled with water = caldera lake<FONT size="+1"> </P ></DIV ><DIV ><P align="justify" ><FONT size="+1">10-1</P ><P align="justify" >CLIMATE CHANGE and GEOMORPHOLOGY<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">C02 & Climate - Complex Causes<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Plates, tectonism, weathering, C02 bio, ocean arc<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">C02 - major control (decline)<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Eocene & Miocene - 700 pp mv - parts per milli (dbble present)<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Rock debree weathered - consumes C02<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Decrease in C02 cools<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Diss-association ofCaSi02 + C02 + H20 ... 2HC03 + CA + 2HC03 -<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">- CaC03 + H20 +C02<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Weathering doubles with 10C increase Temp<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">deep water limestone organisms - subducted<FONT size="+1"> </P ><P align="justify" ><FONT size="+1"><B>Marine</B> : shallow water limestone organisms less frequent.<FONT size="+1"> </P ><P align="justify" ><FONT size="+1"> C- Miocene age of mammals - lush grass and grazers<FONT size="+1"> <FONT size="+1"><B>Land</B>: Plant and leaf shredders (browsers)<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Ocean Arc - Surface & vertical thermo dine<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Temp correlations by 02 isotopes pelagic & benthic<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">(Unstable 018)+(016 (stable) SMOW (standard ocean water)(standard x ocean water)<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Climate Process precession (Earth motions - precession of orbit)<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Milankovich Theory - Mild winter & cool summer produce snow<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">(variation of solar energy)<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Tertiary - Tectonism caused pulling of mud sea & landscape change<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Quartenary - Greenland / Iceland - closure of Panama Isthmus<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Glaciation & glacial sands<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">3.1 -2.4 mi yr ago<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">30 of land covered & uncovered during past 1.3 m/y<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Europe & N A landforms are glacial loess dates to pleistocene time.<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Ice sheets lowered sea level<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Non-analog Climates - boreal forest to 10 degrees of North Pole<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">No freeze in Alaska above Artic Circle to 70 N - How did plants/trees survive in<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Sub tropics in Nantucket & glaciers<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Dry climate - Aw & As ; BW & BS<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Koeppen 10 inch level - of rainfall<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Thomthwaite - evapo-transpiration - temp & daylight<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">Meigs - Steppe vs. desert, prairie, veldt & pampas, loess<FONT size="+1"> </P ><P align="justify" ><FONT size="+1">unesco -<FONT size="+1"> </P ></DIV ></DIV ></BODY> </HTML>
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rsadoo. (Aug 17, 2009). Geomorphology Weekly Notes 10-1.htm. Retrieved Nov 06, 2014, from UMass Boston OpenCourseware Web site: http://ocw.umb.edu/environmental-earth-and-ocean-sciences/eeos-302-geomorphology/Geomorphology%20Weekly%20Notes%2010-1.htm.