A5028445594- Cryospheric studies and observations
- Atmospheric chemistry and aerosols
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Climate variability and models
- Atmospheric aerosols and clouds
- Arctic and Antarctic ice dynamics
- Polar Research and Ecology
- Radioactivity and Radon Measurements
- Atmospheric Ozone and Climate
- Heavy metals in environment
- Geochemistry and Geologic Mapping
- Environmental and Agricultural Sciences
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Groundwater and Isotope Geochemistry
- Per- and polyfluoroalkyl substances research
- Plant responses to elevated CO2
- Winter Sports Injuries and Performance
University of Maine
2007-2022
Abstract. Two ice cores were retrieved from high elevations (~5800 m a.s.l.) at Mt. Nyainqêntanglha and Geladaindong in the southern central Tibetan Plateau region. The combined tracer analysis of tritium (3H), 210Pb mercury, along with other chemical records, provided multiple lines evidence supporting that two coring sites had not received net accumulation since least 1950s 1980s, respectively. These results implied an annual loss rate more than several hundred millimeter water equivalent...
Abstract A multiple parameter dating technique was used to establish a depth/age scale for 171.3 m (145.87 w.e.) surface bedrock ice core (Bl2003) recovered from the cold recrystallization accumulation zone of Western Belukha Plateau (4115 a.s.l.) in Siberian Altai Mountains. The ice-core record presented visible layering annual and δ 18 O/ D stable isotopes, clear tritium reference horizon. steady-state glacier flow model layer thinning calibrated applied scale. Four radiocarbon ( 14 C)...
Abstract Understanding past atmospheric dust variability is necessary to put modern into historical context and assess the impacts of on climate. In Asia, meteorological data temporally limited, beginning only in 1950s. High‐resolution ice cores provide ideal archive for reconstructing preinstrumental concentrations. Using a ~500 year (1477–1982 A.D.) annually resolved calcium (Ca) proxy from Tibetan Plateau (TP) core, we demonstrate lowest concentrations years during latter twentieth...
Abstract The location and intensity of the austral westerlies strongly influence southern hemisphere precipitation heat transport with consequences for human society ecosystems. With future warming, global climate models project increased aridity in mid‐latitudes related to continued poleward contraction westerlies. We utilize Antarctic ice cores investigate past set stage prediction behaviour show that Holocene West core reconstructions atmospheric circulation sensitively record naturally...
High-resolution major and trace element (Al, As, Ca, Cd, Co, Cr, Cu, Fe, Li, Mn, Na, Pb, S, Ti, V) ice core records from Inilchek glacier (5120 m above sea level) on the northwestern margin of Tibetan Plateau provide first multi-decadal record spanning period 1908–1995 AD in central Tien Shan. The reveal pronounced temporal baseline trends concentration maxima characteristic post-1950 anthropogenic emissions. Examination Cd Cu concentrations, along with non-crustal calculation estimates...
Black carbon (BC) deposited on snow and glacier surfaces can reduce albedo lead to accelerated melt. An ice core recovered from Guoqu Mt. Geladaindong analyzed using a Single Particle Soot Photometer (SP2) provides the first long-term (1843–1982) record of BC central Tibetan Plateau. Post 1940 is characterized by an increased occurrence years with above average BC, highest values record. The increase in recent decades likely caused combination emissions regional sources, reduction...
In autumn 2005, a joint expedition between the University of Maine and Institute Tibetan Plateau Research recovered three ice cores from Guoqu Glacier (33°34′37.8″N, 91°10′35.3″E, 5720 m above sea level) on northern side Mt. Geladaindong, central Plateau. Isotopes ( δ 18 O), major soluble ions (Na + , K Mg 2+ Ca Cl − NO 3 SO 4 2− ), radionuclide β ‐activity) measurements one revealed 70‐year record (1935–2005). Statistical analysis ion time series suggests that atmospheric dust species...
Glaciochemistry can provide important information about climatic change and environmental conditions, as well for testing regional global atmospheric trace transport models. In this study, δ18O selected chemical constituents records in snowpits collected from eight glaciers the Tibetan Plateau adjacent areas have been investigated. Drawing on integrated data, our study summarized seasonal spatial characteristics of snow chemistry, their potential sources. Distinct patterns values indicated...
Abstract Using a high‐resolution (~18 samples/year) major soluble ion record (Na + , K Mg 2+ Ca Cl − NO 3 and SO 4 2− ) covering the period 1908–1995 A.D. from Inilchek Glacier, Tien Shan, Kyrgyzstan, we provide detailed climate environmental proxy for region. Chemical concentrations, empirical orthogonal function analyses, noncrustal excess calculations are used to identify natural potential anthropogenic depositional trends. Dominant dust species (i.e., reveal highest concentrations during...
Ice core records provide a robust tool for reconstructing past climate variability and improving our understanding of the relative contributions natural anthropogenic emissions into atmosphere. In particular, heavy metal pollution from poses significant health environmental risk. We present sub-annually dated, continuously sampled Tupungatito ice (TPG-12) data set that documents change in atmospheric Central Chile. Results well-preserved record display pollutant concentrations coincident...
Abstract High-resolution δ 18 O records from a Geladaindong mountain ice core spanning the period 1477-1982 were used to investigate past temperature variations in Yangtze River source region of central Tibetan Plateau (TP). Annual ice-core positively correlated with data nearby meteorological stations, suggesting that record represented air region. A generally increasing trend over 500 years was identified, amplified warming during 20th century. colder stage, before 1850s, found represent...
Abstract A fresh-snow sampling campaign was conducted during the late austral summer of 2006 in accumulation zone Glaciar Marinelli, located Cordillera Darwin, Tierra del Fuego, Chile. Snow samples were analyzed for stable isotopes (δ 18 O), major soluble ions (Na + , K Ca 2+ Mg Cl − NO 3 SO 4 2− MS ) and trace elements (Na, Mg, Al, Fe, Ca, Sr, Cd, Cs, Ba, La, Ce, Pr, Dy, Ho, Er, Bi, U, As, Ti, V, Cr, Mn). The dominance marine chemistry resembles that studies from Patagonian glaciers....
Abstract. Black carbon (BC) deposited on snow and glacier surfaces can reduce albedo lead to accelerated melt. An ice core recovered from Guoqu Mt. Geladaindong analyzed using a Single Particle Soot Photometer provides the first long-term (1843–1982) record of BC concentrations Central Tibetan Plateau. The highest are observed 1975–1982, which corresponds 2.0-fold 2.4-fold increase in average median values, respectively, relative 1843–1940. post-1940 also elevated earlier portion record....
Abstract. Two ice cores were retrieved from high elevations (~ 5800 m a.s.l.) at Mt. Nyainqentanglha and Geladaindong in the southern to inland Tibetan Plateau. The combined analysis of tritium (3H), 210Pb, mercury tracers, along with other chemical records, revealed that two coring sites had not received net accumulation since least 1950s 1980s, respectively, implying an annual loss rate more than several hundred millimeter water equivalent over these periods. Both mass balance modeling...
ABSTRACT We present the first snow/ice chemistry and ice radar results ever collected from South Georgia as part of an initial reconnaissance with ultimate goal assessing feasibility a core to reconstruct past climate in Atlantic. is well situated capture record atmospheric chemical composition over Atlantic variability position intensity austral westerlies. The question how preserved can be recovered region experiencing accelerated melting? presented this paper offer only preliminary step...
通过对 2005 年在各拉丹冬峰北部果曲冰川平坦的粒雪盆(33.58°N, 91.18°E, 5720 m a.s.l.)钻取的 1 支冰芯多参数 的定年, 获得了长江源地区近 70 a 来大气降水中δ 18 O 的历史记录.利用各拉丹冬冰芯δ 与该区域气 象台站夏季气温(7~9 月)之间显著的正相关性, 恢复了近 来各拉丹冬地区夏季气温的变化历史: 1940s 气温较低, 1950s~1960s 中期气温较高, 1970s 中期气温下降到近 来的最低值, 1980s 仍然处在 一个低温期, 而 1990s 以来气温急剧升高的趋势延续到了 21 世纪初期.各拉丹冬冰芯恢复的气温记录 在 以来的增温率(0.5℃/10a)要明显的高于各拉丹冬地区和北半球, 以来的增温率(1.1℃/10 a)约为 以来的 2 倍, 表明近期的增温有加速趋势且高海拔区域对全球变暖的响应更为敏感.
Using the recent compilation of isotopic composition data surface snow Antarctic ice sheet, we proposed an improved interpolation method δD, which utilizes geographical factors (i.e., latitude and altitude) as primary predictors incorporates inverse distance weighting (IDW) technique. The was applied to a high-resolution digital elevation model (DEM) produce grid map multi-year mean δD values with 1km spatial resolution for Antarctica. absolute deviation between observed estimated in is...