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Current Projects Execution of the IGAC project Science Plan and Implementation Strategy (.pdf) is via four main pathways:
IGAC Initiatives AC&C: Atmospheric Chemistry & Climate Joint with WCRP-SPARC This initiative seeks to improve the representation of chemistry/climate interactions in models. See the AC&C web page for more information. ACPC: Aerosols, Clouds, Precipitation & Climate Joint with iLEAPS and GEWEX This effort seeks specifically to better understand how aerosols affect precipitation formation. The Science and Implementation Plan for this activity is currently in the review process. For more information, email the IGAC or iLEAPS project office. Assessment of Atmospheric Chemistry in Mega-cites The IGAC Mega-cities Assessment effort aims to collate the key findings about the atmospheric chemistry in specific mega-cities around the globe; point out where additional studies are needed; compare and contrast atmospheric chemistry in different types of mega-cities; elucidate how lesson learned in carefully studied mega-cities might translate to other less-studied mega-cities; and provide a integrated view and synthesis of the role of mega-cities in regional to global air quality and climate. For more information email igac.seattle@noaa.gov Mega-cites & Coastal Zones: An IGBP Fast Track Initiative The overarching scientific questions to be addressed under this initiative are: • How do air-sea interactions (such as trace gas emissions and seasalt aerosol formation) within the coastal zone affect air pollution within and around mega cities? • How do the interactions of large urban emissions and the marine boundary layer affect local climate? • How do atmospheric deposition of both contaminants and nutrients from megacities affect the productivity of adjacent coastal waters? There are of course also feedbacks between these issues such as changes in marine trace gas emissions due to changes in marine productivity which will also be addressed. This initiative is just now in the planning stages, with the first workshop expected in February 2010 and a journal publication planned for late Spring/early Summer 2010. IGAC Tasks Researchers interested in a Task should contact the Task Coordinators. Contact information can be found by clicking on "Learn More..." under the Task of interest. AICI: Air-Ice Chemical Interactions It has only recently been realized that not only can surface snow and ice affect atmospheric chemistry, but atmospheric chemistry can also influence the snowpack. The AICI Task team seeks to document the full range of processes and trace gases that are exchanged at the air/ice and snow/ice interfaces by employing laboratory and field experiments and by using models. Key controlling processes and constituents will be determined in order that parameterizations can be formulated for implementation in global chemical models. AICI has been jointly endorsed by IGAC and SOLAS (Surface Ocean Lower Atmosphere Study; also an IGBP Core Project). Learn More about the AICI Task... Go to AICI web page at Purdue University AICI Special Issue of Atmospheric Chemistry & Physics Link to articles summarizing outcomes of AICI Task To order hard-copies of the AICI ACP Special Issue, go here and specify you want to order a hard copy of the AICI Special Issue of ACP. ITCT-Lagrangian-2k4: Intercontinental Transport and Chemical Transformation The primary goal of this Task is to understand the chemical transformation and removal processes of aerosols, oxidants and their precursors during the intercontinental transport process. ITCT-Lagrangian-2k4 specifically will use measurements from a field campaign taking place in Summer 2004 in the North Atlantic region. Although this campaign will not include true Lagrangian measurements, several U.S.-funded platforms will be making nearly simultaneous measurements in the northeast U.S. coastal region, while British, German and French platforms will be making measurements in the eastern north Atlantic. The ITCT Task Team's goal will be to facilitate platform coordination (during the campaign) and collaborative data analysis (post-campaign) such that a pseudo-Lagrangian analysis is possible. Learn More about the ITCT-2k4 Task... Mega-cities: Asia To date, many of the large-scale, coordinated measurements of aerosols and oxidants have taken place in regions well downwind of sources. However, it is only by making measurements near the sources that we will be able to accurately make the link between source emissions and regional-scale air quality and climate impacts. The Mega-cities: Asia Task Team's goal is to facilitate better coordination between groups making measurements of aerosols and oxidants in and around large cities in Asia. Their activities will include maintaining a centralized web page; holding periodic workshops to increase communication between reasearch groups; organizing instrument intercomparisons; and facilitating collaborative publications. The IGAC SSC hopes that this is the first in a series of Mega-cities Tasks to study emissions from each of the large city clusters around the globe. Learn More about the Mega-cities Task... Go to the Mega-cities:Asia web page at Univ. of Tokyo AMMA-AC: African Monsoon Multidisciplinary Analysis - Atmospheric Chemistry AMMA is an international, integrated, multidisciplinary project that aims at addressing both fundamental scientific questions related to the understanding of the West African Monsoon (WAM) variability and the impacts and practical issues related to prediction and decision-making activity. The AMMA-AC proposal focuses on the atmospheric chemistry component of the AMMA project, specific aspects of which are part of the IGAC Task. Three scientific questions will be addressed within AMMA-AC: Question 1: What are the interactions between lightning, biomass burning, the biosphere, the ocean, human activity and growing urbanization which determine tropospheric ozone concentrations over Western Africa? Question 2: What are the interactions between dust, biomass burning, the biosphere, the ocean, human activity and growing urbanization which determine aerosol production and properties over Western Africa? Question 3: What is the role of deep convection, the monsoon circulation and other flow patterns in the transport and processing of these emissions and how do these emissions affect the dynamics of the WAM? Learn More about the IGAC AMMA-AC Task... Go to the AMMA International Project web page at Medias France DEBITS: Deposition of Biogeochemically Important Trace Species Wet and dry deposition of chemical species to the earth's surface plays an essential role in controlling the concentration of gases and aerosols in the troposphere. Recognizing this, the DEBITS program was initiated in 1990 under the first phase of IGAC. Measurements in three regions (Asia, Africa and Amazonia) were established, resulting in a strong network of international scientist producing comparable, quality-controlled data sets. These measurements will continue under Phase II of the DEBITS Task. In addition, there will be a focus on integrating the DEBITS data into the larger context of responses and feedbacks within the Earth System at both the regional and global scales. Learn More about the IGAC DEBITS Task... POLARCAT: Polar Study using Aircraft, Remote Sensing, Surface Measurements and Models, of Climate Chemistry, Aerosols and Transport This project is proposed as a component of the upcoming International Polar Year (March 2007-2009). POLARCAT seeks to study several phenomena unique to the polar regions, including: the Arctic Haze, a recurring winter/spring phenomenon resulting from long-range transport of anthropogenic pollution mostly from Europe and western Asia; summertime pollution in the Arctic, originating from forest fires prevalent in the boreal region; and chemical phenomena unique to the Arctic troposphere. All of these phenomena are strongly influenced by the coupling of surface exchange processes, vertical transport, unique Arctic air chemistry, and import from and export to mid-latitude regions. POLARCAT will use a a series of experiments involving aircraft, surface stations and ships. Measurements will be made at different times of the year in order to follow pollution plumes of different origins as they are transported into the Arctic and observe the chemistry, aerosol processes, and radiation effects of these plumes. The experiments will also take advantage of the long residence times of pollutants in the stably stratified Arctic atmosphere to study ageing. Models of differing complexity will be used to test our understanding of Arctic processes against the measurement data sets. Learn More about the IGAC POLARCAT Task... Go to the POLARCAT Project web page at the Norsk institutt for luftforskning (NILU; Norway) HitT: Halogens in the Troposphere Reactive halogen compounds (X, XO, X2, XY, OXO, HOX, XONO2, XNO2, where X,Y=Cl, Br, I) - in particular halogen oxides - are present in various domains throughout the troposphere. The primary objective of the project HitT is to determine and quantify the importance of reactive halogen compounds (RHCs) in tropospheric chemistry and climate forcing. Key themes are the influence of RHC on the oxidative capacity of the atmosphere, the ozone budget, as well as in aerosol nucleation and growth. A comprehensive white paper (3.1 MByte .pdf) on the subject was used as the basis for this IGAC Task, which is co-endorsed by IGBP's SOLAS project. Learn More about the IGAC HitT Task... 
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