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| 1 | Water isotope variations in the snow pack and summer precipitation at July 1 Glacier, Qilian Mountains in northwest China显示文摘This paper presents the stable isotope data of the snow pack and summer precipitation collected at the July 1 Glacier, Qilian Mountains in northwest China and analyses their relationships with meteorologi- cal factors. On an event scale, there is no temperature effect on the δ 18O values in the summer pre- cipitation, whereas the amount effect is shown to be clear. By tracing the moisture transport history and comparing the precipitation with its isotopic composition, it is shown that this amount effect not only reflects the change in moisture trajectory, which is related to the monsoon activities, but is also associated with the cooling degree of vapor in the cloud, the evaporation of falling raindrops and the isotopic exchange between the falling drops and the atmospheric vapor. As very little precipitation occurs in winter, the snow pack profile mainly represents the precipitation in the other three seasons. There are low precipitation δ 18O ratios in summer and high ratios in spring and autumn. The Meteoric Water Line (MLW) for the summer precipitation is δ D = 7.6 δ 18O + 13.3, which is similar to that at Delingha, located in the south rim of the Qilian Mountains. The MWL for the snow pack is δ D = 10.4 δ 18O + 41.4, showing a large slope and intercept. The deuterium excess (d) of the snow pack is positively correlated with δ 18O, indicating that both d and δ 18O decrease from spring to summer and increase from early autumn to early spring. This then results in the high slope and intercept of the MWL. Sea- sonal fluctuations of d in the snow pack indicate the change of moisture source and trajectory. During spring and autumn, the moisture originates from continental recycling or rapid evaporation over rela- tively warm water bodies like Black, Caspian and Aral Seas when the dry westerly air masses pass over them, hence very high d values in precipitation are formed. During summer, the monsoon is responsi- ble for the low d values. This indicates that the monsoon can reach the western part of the Qilian Mountains. | ZHOU ShiQiao NAKAWO Masayoshi SAKAI Akiko MATSUDA Yoshihiro DUAN KeQin PU JianChen | 2007 | Chinese Science Bulletin2007，52，21： | 21 |
| 2 | Accumulation in Dasuopu ice core in Qinghai-Tibet Plateau and solar activity显示文摘The time series of accumulation in recent 300 years correlated well with solar activity in Dasuopu ice core. Results of spectrum analysis on the accumulation time series of the Dasuopu ice core shows that there are some periods that coincide with the periods of solar activity. By comparing the long-time change trend of the accumulation in the Dasuopu ice core with various kinds of indexes of solar activity intensity, a negative correlation is found between the trend and solar activity. | Keqin Duan Ninglian Wang Yuefang Li Weizheng Sun | 2000 | Chinese Science Bulletin2000，45，11： | 8 |
| 3 | Numerical simulation of Urumqi Glacier No.1 in the eastern Tianshan,central Asia from 2005 to 2070显示文摘Due to climate changes, most of the alpine glaciers have retreated dramatically during the past decades. Thus it is significant to predict the alpine glacier variability in the future for a better understanding of the impact of climate changes on water resource. In this paper, we perform the numerical simulation on Urumqi Glacier No.1 in the eastern Tianshan, central Asia (hereafter Glacier No.1 for short) by considering both the mass balance and ice flow. Given the shape of the Glacier No.1, the velocity of the glacier is obtained by solving a two-dimensional nonlinear Stokes equation and simulated result is in agreement with the observation. In order to predict the variability of Glacier No.1 in the next decades, a climatic scenario is constructed with a temperature rise rate as 0.17°C/10 a and precipitation as constant during the period of 2005-2070. The simulation shows that, the glacier terminus will retreat slowly and the glacier will thin dramatically before 2040, while after year 2040, the glacier terminus retreat will accelerate. This study confirms the increasing retreat rate of alpine glaciers under global warming. | DUAN KeQin YAO TanDong WANG NingLian LIU HuanCai | 2012 | Chinese Science Bulletin2012，57，34： | 7 |
| 4 | Response of monsoon vari-ability in Himalayas to global warming显示文摘Reconstructed annual net accumulation from the Dasuopu ice core recovered in Himalayas, with a good correlation to Indian monsoon, reflects a major precipitation trend in central Himalayas. The Dasuopu accumulation (DSP An) also shows a strong correlation to the Northern Hemispheric temperature. Generally, as the Northern Hemispheric temperature increases by 0.1 K, the accumulation decreases by about 90 mm and vise versa. Under the condition of global warming, especially since 1920, the Northern Hemispheric mean temperature has increased by about 0.5 K, whereas accumulation in Dasuopu ice core has decreased by about 450 mm. According to the relationship between accumulation and temperature, a scenario prediction of monsoon rainfall in central Himalayas is made. | DUAN Keqin YAO Tandong PU Jianchen SUN Weizhen | 2002 | Chinese Science Bulletin2002，47，21： | 6 |
| 5 | Events of abrupt change of Indian monsoon recorded in Dasuopu ice core from Himalayas显示文摘Three ice cores distributed across Dasuopu glacier in Himalayas were recovered. A 400-year net annual accumulation record reconstructed from one of the cores reflects the major precipitation trend in the central Himalayas. This record is related closely to the Indian monsoon precipitation. Wavelet and moving T-test were applied to the 400-year-long Dasuopu accumulation record, and significant staggered variability and abrupt change of the record on interannual to centennial time scales are identified. Finally the possible reason for abrupt change of the accumulation record is discussed. | Keqin Duan Ninglian Wang Jianchen Pu | 2002 | Chinese Science Bulletin2002，47，8： | 5 |
| 6 | Environmental information recorded in shallow ice core of Dasuopu glacier in the Qinghai-Tibetan Plateau显示文摘 | Cuilan Huang Tandong Yao Jianchen Pu Keqin Duan Ninglian Wang Lide Tian | 1998 | Chinese Science Bulletin1998，43，22： | 5 |
| 7 | Precipitation variability in central Himalayas and its relation to Northern Hemisphere temperature显示文摘A 149.8-m-long ice core was drilled at theaccumulation area of Dasuopu glacier (28?3′N, 85?3′E, 7100 m a.s.l.) in the central Himalayas in 1997. The ice core was analyzed continuously for stable isotopes (d 18O), cations (Na+, K+, Mg2+, Ca2+) and anions (Cl-, 24SO,-3NO-) throughout the core. Cycles indicated by d 18O, cations and anions were identified and counted as seasonal fluctuations as annual increment from maximum to maximum values.Reconstructed 300-year annual net accumulation from thecore reveals a major precipitation trend for the central Himalayas with an average precipitation 750 mm per year. The trend, separated from the time series, shows a strongcorrelation to global temperature. Generally, as northernglobal temperature increases 0.1℃, the accumulationdecreases about 80mm and vise versa. This may suggests that monsoon precipitation in Himalayas have decreasedcontinuously in past decade as a response to global warming. | DUAN Keqin YAO Tandong | 2003 | Chinese Science Bulletin2003，48，14： | 3 |
| 8 | Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D显示文摘 | Hongping Duan Keqin Du Chuanwei Yan Fuhui Wang | 2005 | Electrochimica Acta2005，，14： | 3 |
| 9 | Seasonal variations of dust record in the Muztagata ice cores显示文摘Based on the oxygen isotope ratio and microparticle record in ice cores recovered at Mt. Muztagata, Eastern Pamirs, the seasonal variations of atmospheric dust have been reconstructed for the past four decades. High dust concentrations and coarser particle grains have the similar trend with oxygen iso- tope value. Our statistical results indicate that 50%―60% high dust concentration samples occur dur- ing the season with high oxygen isotope values (summer), while low dust storm frequency during spring and winter. Back-trajectory analysis shows that the air mass hitting Muztagata predominately came from West Asia (such as Iran-Afghanistan Plateau) and Central Asia, which are the main dust source area for Muztagata. Dust storms in those source areas most frequently occur during summer (from May to August), while frequent dust storm events in northern China mainly occur during spring (March to May). Regions in the path of Asian dust transport, such as in Japan, the North Pacific, and Greenland, also show high dust concentrations during spring (from March to May). Our results indicate that dust storms have different seasonality in different regions within Asia. | WU GuangJian YAO TanDong XU BaiQing TIAN LiDe LI Zhen DUAN KeQin | 2008 | Chinese Science Bulletin2008，53，16： | 3 |
| 10 | Improved Land Use and Leaf Area Index Enhances WRF-3DVAR Satellite Radiance Assimilation: A Case Study Focusing on Rainfall Simulation in the Shule River Basin during July 2013显示文摘The application of satellite radiance assimilation can improve the simulation of precipitation by numerical weather prediction models. However, substantial quantities of satellite data, especially those derived from low-level(surface-sensitive)channels, are rejected for use because of the difficulty in realistically modeling land surface emissivity and energy budgets.Here, we used an improved land use and leaf area index(LAI) dataset in the WRF-3 DVAR assimilation system to explore the benefit of using improved quality of land surface information to improve rainfall simulation for the Shule River Basin in the northeastern Tibetan Plateau as a case study. The results for July 2013 show that, for low-level channels(e.g., channel 3),the underestimation of brightness temperature in the original simulation was largely removed by more realistic land surface information. In addition, more satellite data could be utilized in the assimilation because the realistic land use and LAI data allowed more satellite radiance data to pass the deviation test and get used by the assimilation, which resulted in improved initial driving fields and better simulation in terms of temperature, relative humidity, vertical convection, and cumulative precipitation. | Junhua YANG Zhenming JI Deliang CHEN Shichang KANG Congshen FU Keqin DUAN Miaogen SHEN | 2018 | Advances in Atmospheric Sciences2018，35，6： | 2 |
| 11 | Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D显示文摘 | Hongping Duan Keqin Du Chuanwei Yan | 2006 | Electrochimica Acta2006，51，14： | 1 |
| 12 | Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D显示文摘 | Duan Hongping Du Keqin Yan Chuanwei | 2006 | Electrochimica Acta2006，51，： | 1 |
| 13 | Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D显示文摘 | Hongping Duan Keqin Du Chuanwei Yah | | Electrochimica Acta0，51，14： | 1 |
| 14 | Low-frequency of southern Asian monsoon variability using a 295-year record from the Dasuopu ice core in the central Himalayas显示文摘 | Duan Keqin Yao Tandong Thompson LG | 2004 | Geophysical Research Letters2004，31，16： | 1 |
| 15 | Temperature and methane records over the last 2 ka in Dasuopu ice core显示文摘 | Tandong Yao L. G. Thompson Keqin Duan Baiqing Xu Ninglian Wang Jianchen Pu Lide Tian Weizhen Sun Shichang Kang Xiang Qin | 2002 | Science in China Series D: Earth Sciences2002，，12： | 1 |
| 16 | Temperature and methane records over the last 2 ka in Dasuopu ice core显示文摘 | Tandong Yao L. G. Thompson Keqin Duan Baiqing Xu Ninglian Wang Jianchen Pu Lide Tian Weizhen Sun Shichang Kang Xiang Qin | 2002 | Science in China Series D: Earth Sciences2002，，12： | 1 |
| 17 | Ammonium record over the last 96 years from the Muztagata glacier in Central Asia显示文摘As a major alkaline gas in the atmosphere, ammonia (NH3) plays an important role in atmospheric chemistry. However, there is little knowledge about NH3 variations in the Central Asia. Here we ana- lyzed the ammonium (NH+4) history recorded in an ice core from the East Pamir in Central Asia, which was drilled on the Mt. Muztagata at the elevation of 7010 m a.s.l. in 2003. The core was carefully dated and NH4+ concentration history during 1907―2002 was reconstructed. The result shows that NH4+ con- centration remained approximately constant until the 1930s after a sudden decrease at the very begin- ning of the 20th century, followed by a minimum in 1940 before increasing steadily to the peak at the end of 1990s. It is found that the annual mean NH4+ concentration was strongly associated with the Northern Hemisphere temperature, suggesting the impact of temperature on NH3 emissions in the Central Asia. Moreover, an increase of NH+4 concentration after 1940 also reflects the enhancement of NH3 emissions from anthropogenic sources such as fertilizer applications and livestock wastes in the 20th century. | ZHAO HuaBiao YAO TanDong XU BaiQing LI Zhen DUAN KeQin | 2008 | Chinese Science Bulletin2008，53，8： | 1 |
| 18 | Temperature and methane records over the last 2 ka in Dasuopu ice core显示文摘 | Tandong Yao L. G. Thompson Keqin Duan Baiqing Xu Ninglian Wang Jianchen Pu Lide Tian Weizhen Sun Shichang Kang Xiang Qin | 2002 | Science in China Series D: Earth Sciences2002，，12： | 1 |
| 19 | Temperature and Methane changes over the past 1000 years recorded in Dasuopu ice core 显示文摘 | Yao Tandong Duan Keqin Xu Baiqing | 2001 | Annals of Glaciology2001，35，： | 1 |
| 20 | Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D显示文摘 | DUAN Hongping DU Keqin YAN Chuanwei | 2006 | Eletrochimica Acta2006，51，14： | 1 |
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