noaa-icecore-17837 GISP2 Ice Core GISP2 Air Mass Trajectories Kahl, J.D.W.; Martinez, D.A.; Kuhns, H.; Davidson, C.I.; Jaffrezo, J.-L.; Harris, J.M. GISP2 Ice Core GISP2 Air Mass Trajectories 1997-11-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17837 Investigator J.D.W. Kahl Investigator D.A. Martinez Investigator H. Kuhns Investigator C.I. Davidson Investigator J.-L. Jaffrezo Investigator J.M. Harris earth science paleoclimate paleoclimatic modeling age,null,null,hour of day,null,paleoclimatic modeling,null,null,N,500 mb trajectory earth science paleoclimate paleoclimatic modeling age,null,null,day of month,null,paleoclimatic modeling,null,null,N,700 mb trajectory earth science paleoclimate paleoclimatic modeling longitude,null,null,degree east,null,paleoclimatic modeling,null,null,N,700 mb trajectory earth science paleoclimate paleoclimatic modeling age,null,null,month of year,null,paleoclimatic modeling,null,null,N,500 mb trajectory earth science paleoclimate paleoclimatic modeling age,null,null,day of month,null,paleoclimatic modeling,null,null,N,500 mb trajectory earth science paleoclimate paleoclimatic modeling latitude,null,null,degree north,null,paleoclimatic modeling,null,null,N,700 mb trajectory earth science paleoclimate paleoclimatic modeling longitude,null,null,degree east,null,paleoclimatic modeling,null,null,N,500 mb trajectory earth science paleoclimate paleoclimatic modeling latitude,null,null,degree north,null,paleoclimatic modeling,null,null,N,500 mb trajectory earth science paleoclimate paleoclimatic modeling age,null,null,month of year,null,paleoclimatic modeling,null,null,N,700 mb trajectory earth science paleoclimate paleoclimatic modeling age,null,null,hour of day,null,paleoclimatic modeling,null,null,N,700 mb trajectory earth science paleoclimate ice core instrumental data geoscientificInformation 1946 AD 1989 AD 4 cal yr BP -39 cal yr BP Complete 72.6 72.6 -38.5 -38.5 3200 3200 Continent North America Greenland GISP2>LATITUDE 72.6>LONGITUDE -38.5 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Jonathan D. W. Kahl, Dewayne A. Martinez, Hampden Kuhns, Clifford I. Davidson, Jean‐Luc Jaffrezo, Joyce M. Harris 1997 Journal of Geophysical Research: Oceans 102 C12 26861-26875 10.1029/97JC00296 http://onlinelibrary.wiley.com/enhanced/doi/10.1029/97JC00296

The seasonal variation in atmospheric transport patterns to Summit, Greenland, is examined using a 44-year record of daily, 10-day, isobaric back trajectories at the 500-hPa level. Over 24,000 modeled trajectories are aggregated into distinct patterns using cluster analysis. Ten-day trajectories reaching Summit are longest during winter, with 67% extending upwind (westward) as far back as Asia or Europe. Trajectories are shortest during summer, with 46% having 10-day origins over North America. During all seasons a small percentage (3-7%) of trajectories originate in west Asia/Europe and follow a meridional path over the Arctic Ocean before approaching Summit from the northwest. Trajectories at the 700-hPa level tend to be shorter than at 500 hPa, with many of the 700-hPa trajectories from North America tracking over the North Atlantic and approaching Summit from the south. The long-range transport climatology for Summit is similar to a year-round climatology prepared for Dye 3, located 900 km to the south [Davidson et al., 1993b]. An analysis of several aerosol species measured at Summit during summer 1994 reveals examples of the usefulness and also the limitations of using long-range air trajectories to interpret chemical data. STUDY NOTES: The included data sets are files for 500 mb and 700 mb atmospheric trajectories for the Greenland Summit.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/traject/traject.txt Information File; GISP2 Atmospheric Trajectory Readme File GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/traject/700traj/ Data Folder; 700mb Trajectory Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/traject/500traj/ Data Folder; 500mb Trajectory Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11