Cooperative Institute for Research in Environmental Sciences

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International Glaciological Society Seminar

International Glaciological Society Seminar

International Symposium on Polar Ice, Polar Climate, Polar Change: Remote sensing and modeling advances in understanding the cryosphere


The changes of the past 15 years in Arctic and Antarctic sea ice and the ice sheets appear to be a prelude to new levels of impact of the polar regions on global climate and sea level. The first-year ice system is expanding in the Arctic, with processes comparable to those of Antarctic sea ice. Antarctic sea-ice extent is highly variable and is responding to shifts in ocean circulation and wind patterns. Both polar sea-ice systems interact in important ways with climate and with the adjacent ice sheets. Much of the growing awareness and understanding of polar change hascome from the tremendous success of satellite and airborne remote sensing, supporting both process studies and modeling of the geophysical basis for observed changes. The proposed symposium will both summarize new, high-profile results from the international research communities and provide a synthesis of current understanding as climate change impacts continue.
 

Full program of all events: https://www.igsoc.org/symposia/2017/boulder/proceedings/programmepure.html

date

Monday, August 14, 2017 to Monday, August 21, 2017
8:00am to 5:00pm

location

University Memorial Center, University of Colorado Boulder

Event Type

Seminar

contact

International Glaciological Society, igsoc@igsoc.org
2017-08-14 to 2017-08-21
 
NOAA Chemical Sciences Division Seminar

NOAA Chemical Sciences Division Seminar

A Fresh Look at Dirty Air: 40 years of effort to reach the U.S. ozone NAAQS by David Parrish, NOAA ESRL CSD & CIRES/CU Boulder

In the 1950s and 1960s the U.S. (particularly the Los Angeles urban area) experienced extremely poor air quality; measured ambient ozone concentrations in those decades have not been equaled anywhere else in the world. Although today many U.S. urban areas still exceed the ozone National Ambient Air Quality Standard (NAAQS), air quality has been greatly improved; however this improvement required more than 4 decades of concerted effort. Here we present a simple quantitative relationship that provides an excellent fit for the temporal evolution of ambient ozone concentrations, not only in the Los Angeles urban area (i.e., the South Coast Air Basin), but also all southern California air basins. Background ozone transported into the U.S. makes substantial contributions to ambient concentrations. The quantitative fit to the temporal evolution of ambient ozone concentrations allows observationally-based estimates of the magnitude of U.S. background ozone concentrations (i.e., the ambient ozone concentration that would be present in the absence of U.S. anthropogenic emissions of ozone precursors) in the respective air basins. Projection of the past temporal evolution into the future, suggests that reducing ozone to the 2015 NAAQS may be more difficult than currently expected. Comparisons of observationally-based estimates of U.S. background ozone concentrations to those from model calculations find significant disagreements, whose causes will be investigated.

Remote Access: Webinar Registration

 

 

date

Wednesday, August 16, 2017
3:30pm

location

DSRC (NOAA Building), Room 2A305, 325 Broadway, Boulder

Event Type

Seminar

contact

Jeanne Waters, 303-497-3134, Jeanne.S.Waters@noaa.gov
2017-08-16