Scientists reconstruction past ice sheets because they want to know how glaciers and ice sheets interact with climate and with the ocean we can observe modern glaciers melting we can look at the surface of ice sheets with satellite images and calculate changes in mass balance and we can map mountain glacier recession.
Origin and definition the last glacial period is sometimes colloquially referred to as the last ice age though this use is incorrect because an ice age is a longer period of cold temperature in which yearround ice sheets are present near one or both poles glacials are colder phases within an ice age in which glaciers advance glacials are separated.
An ice core is a core sample that is typically removed from an ice sheet or a high mountain glaciersince the ice forms from the incremental buildup of annual layers of snow lower layers are older than upper and an ice core contains ice.
Global warming volcanic aerosols explosive volcanic eruptions have the potential to inject substantial amounts of sulfate aerosols into the lower stratosphere in contrast to aerosol emissions in the lower troposphere see above aerosols aerosols that enter the stratosphere may remain for several years before settling out because of the relative.
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This paper reports a climatic reconstruction approach for the minho region nw of portugal using grape harvest dates ghd as proxy of surface air temperature this new ghd series was built based on the records from a set of local and regional newspapers 18541978 and the annuals of a wine producers cooperative 19782010.