naa a22 4500 51074978X CHVBK 20180411083100.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11270-013-1653-7 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1653-7 Long-Term Trends in Cloud and Rain Chemistry on Mount Washington, New Hampshire [Elektronische Daten] [Georgia Murray, Kenneth Kimball, L. Hill, Jane Hislop, Kathleen Weathers] Growing season rain and cloud events were sampled between 1984-2010 at Lakes of the Clouds (LOC) (1,540m above sea level (ASL)) which is 1.6km SW of the summit of Mount Washington, NH (1,914m ASL). Mount Washington's summit is in the clouds ca. 51% of the time. All samples were measured for pH, while cations and anions were measured consistently from 1996 to 2010. Annual mean cloud and rain water hydrogen ion concentrations declined significantly from 1984-2010. Nighttime cloud and rain hydrogen, sulfate, ammonium, and nitrate ion concentrations were significantly greater compared to daytime. Ion mean concentrations declined over the 1996-2010 timeframe and more rapidly since 2005. Co-located filter-based aerosol measurement (PM2.5) at LOC had higher ratios of ammonium to sulfate in summer daytime samples post (1995-2010) full implementation of the 1990 Clean Air Act Amendments. This suggests a shift towards more neutralized sulfate aerosol dissolution into clouds with relatively more ammonium and declines in acidity. The origin of cloud water sampled, which ranges from regional fronts to orographic lower elevation air mass uplift, along with the diurnally shifting nocturnal boundary layer that often puts the LOC site in and out of the mixed layer, likely contributes to the diurnal and inter-annual variability observed. Springer Science+Business Media Dordrecht, 2013 Acidity nationallicence Clean Air Act Amendments nationallicence Cloud and rain water chemistry nationallicence Montane nationallicence Mount Washington NH nationallicence Nocturnal boundary layer nationallicence Nitrogen nationallicence Sulfur nationallicence Murray Georgia Appalachian Mountain Club, 03581, Gorham, NH, USA aut Kimball Kenneth Appalachian Mountain Club, 03581, Gorham, NH, USA aut Hill L. Clean Air Task Force, Boston, MA, USA aut Hislop Jane USDA Forest Service, Durham, NH, USA aut Weathers Kathleen Cary Institute of Ecosystem Studies, Millbrook, NY, USA aut Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-14 0049-6979 224:9<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1653-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1653-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Murray Georgia Appalachian Mountain Club, 03581, Gorham, NH, USA aut NATIONALLICENCE 700 1- Kimball Kenneth Appalachian Mountain Club, 03581, Gorham, NH, USA aut NATIONALLICENCE 700 1- Hill L. Clean Air Task Force, Boston, MA, USA aut NATIONALLICENCE 700 1- Hislop Jane USDA Forest Service, Durham, NH, USA aut NATIONALLICENCE 700 1- Weathers Kathleen Cary Institute of Ecosystem Studies, Millbrook, NY, USA aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-14 0049-6979 224:9<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer