scholarly journals Oxygen-18 concentrations in recent precipitation and ice cores on the Tibetan Plateau

2003 ◽  
Vol 108 (D9) ◽  
pp. n/a-n/a ◽  
Author(s):  
L. Tian ◽  
T. Yao ◽  
P. F. Schuster ◽  
J. W. C. White ◽  
K. Ichiyanagi ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Ice Cores ◽  
The Tibetan Plateau

scholarly journals The visible spectroscopy of iron oxide minerals in dust particles from ice cores on the Tibetan Plateau

Tellus B ◽  
2016 ◽  
Vol 68 (1) ◽  
pp. 29191 ◽  
Author(s):  
Guangjian Wu ◽  
Tianli Xu ◽  
Xuelei Zhang ◽  
Chenglong Zhang ◽  
Ni Yan
Keyword(s):  
Iron Oxide ◽  
Tibetan Plateau ◽  
Ice Cores ◽  
Dust Particles ◽  
The Tibetan Plateau ◽  
Visible Spectroscopy ◽  
Oxide Minerals

scholarly journals Temperature variations over the past millennium on the Tibetan Plateau revealed by four ice cores

2007 ◽  
Vol 46 ◽  
pp. 362-366 ◽  
Author(s):  
Tandong Yao ◽  
Keqin Duan ◽  
L.G. Thompson ◽  
Ninglian Wang ◽  
Lide Tian ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
19Th Century ◽  
Northern Hemisphere ◽  
Ice Core ◽  
Ice Cores ◽  
Ice Age ◽  
The Tibetan Plateau ◽  
Late 19Th Century ◽  
The Past ◽  
Northern Tibetan Plateau

AbstractTemperature variation on the Tibetan Plateau over the last 1000 years has been inferred using a composite δ18O record from four ice cores. Data from a new ice core recovered from the Puruogangri ice field in the central Tibetan Plateau are combined with those from three other cores (Dunde, Guliya and Dasuopu) recovered previously. The ice-core δ18O composite record indicates that the temperature change on the whole Tibetan Plateau is similar to that in the Northern Hemisphere on multi-decadal timescales except that there is no decreasing trend from AD 1000 to the late 19th century. The δ18O composite record from the northern Tibetan Plateau, however, indicates a cooling trend from AD 1000 to the late 19th century, which is more consistent with the Northern Hemisphere temperature reconstruction. The δ18O composite record reveals the existence of the Medieval Warm Period and the Little Ice Age (LIA) on the Tibetan Plateau. However, on the Tibetan Plateau the LIA is not the coldest period during the last millennium as in other regions in the Northern Hemisphere. The present study indicates that the 20th-century warming on the Tibetan Plateau is abrupt, and is warmer than at any time during the past 1000 years.

scholarly journals Holocene climate variability archived in the Puruogangri ice cap on the central Tibetan Plateau

2006 ◽  
Vol 43 ◽  
pp. 61-69 ◽  
Author(s):  
Lonnie G. Thompson ◽  
Yao Tandong ◽  
Mary E. Davis ◽  
Ellen Mosley-Thompson ◽  
Tracy A. Mashiotta ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Ice Core ◽  
Ice Cores ◽  
The Tibetan Plateau ◽  
Climate History ◽  
Ice Caps ◽  
Ice Cap ◽  
Monsoon System ◽  
The Tropics ◽  
Ice Core Records

AbstractTwo ice cores (118.4 and 214.7 m in length) were collected in 2000 from the Puruogangri ice cap in the center of the Tibetan Plateau (TP) in a joint US-Chinese collaborative project. These cores yield paleoclimatic and environmental records extending through the Middle Holocene, and complement previous ice-core histories from the Dunde and Guliya ice caps in northeast and northwest Tibet, respectively, and Dasuopu glacier in the Himalaya. The high-resolution Puruogangri climate record since AD 1600 details regional temperature and moisture variability. The post-1920 period is characterized by above-average annual net balance, contemporaneous with the greatest 18O enrichment of the last 400 years, consistent with the isotopically inferred warming observed in other TP ice-core records. On longer timescales the aerosol history reveals large and abrupt events, one of which is dated ∼4.7 kyr BP and occurs close to the time of a drought that extended throughout the tropics and may have been associated with centuries-long weakening of the Asian/Indian/African monsoon system. The Puruogangri climate history, combined with the other TP ice-core records, has the potential to provide valuable information on variations in the strength of the monsoon across the TP during the Holocene.

scholarly journals Volume-size distribution of microparticles in ice cores from the Tibetan Plateau

2009 ◽  
Vol 55 (193) ◽  
pp. 859-868 ◽  
Author(s):  
Guangjian Wu ◽  
Tandong Yao ◽  
Baiqing Xu ◽  
Lide Tian ◽  
Chenglong Zhang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Normal Distribution ◽  
Ice Cores ◽  
Normal Function ◽  
Dust Particles ◽  
Volume Distribution ◽  
The Tibetan Plateau ◽  
Log Normal ◽  
Log Normal Distribution ◽  
Volume Size

AbstractThe volume distribution of atmospheric dust particles (microparticles) of 1–30 μm diameter in Muztagata, Dunde, Dasuopu and Everest ice cores from the Tibetan Plateau was measured and fitted as a log-normal function in order to characterize their basic size properties. Our results reveal that whether the volume distribution fits the log-normal function or not largely depends on the dust concentration and the specific dust-storm event but is independent of physiographical location and season. Our results show only high-concentration samples obey the log-normal distribution in volume, with mode sizes ranging from 3 to 161 μm. The log-normal distribution was largely attributed to the mid-sized particles between 3 and 15 μm, which contribute most (>70%) of the total volume. The volume size distribution characteristics for mineral dust particles from ice cores reveal that the coarse particles might be common in the upper-level troposphere over the Tibetan Plateau. These dust size features are useful to advance our understanding of dust effects on climate, and provide clues to better characterize atmospheric dynamics over the Tibetan Plateau that will help to improve the current models.

scholarly journals 1000 years of climatic change in China: ice-core δ18O evidence

1995 ◽  
Vol 21 ◽  
pp. 189-195 ◽  
Author(s):  
P. N. Lin ◽  
L.G. Thompson ◽  
M.E. Davis ◽  
E. Mosley-Thompson
Keyword(s):  
Tibetan Plateau ◽  
Eastern China ◽  
Ice Core ◽  
Empirical Relationship ◽  
Ice Cores ◽  
Western China ◽  
The Tibetan Plateau ◽  
Ice Caps ◽  
Recent Warming ◽  
Reconstructed Temperature

Since 1987, ice cores have been drilled from the Dunde and Guliya ice caps on the Tibetan Plateau, western China. Here, the oxygen isotopic (δ18O) records for the last 1000 years from both these cores are compiled and compared. Using surface temperature observations since the mid-1960s from meteorological stations on the plateau and δ18O measured on precipitation collected contemporaneously, the empirical relationship: δ18O = 0.6 T s – 12 is established. δ18O appears to serve as a reasonable proxy for regional surface temperatures and a reasonable basis for reconstructing 1000a proxy temperature records from Dunde and Guliya. The reconstructed temperature histories for Dunde (on the eastern Tibetan Plateau) and Guliya (on the western Tibetan Plateau) show some centennial-scale similarities, but reveal quite different histories for higher-frequency variability over the last millennium. The ice-core δ18O histories from Dunde and Guliya are compared with a tree-ring index from western China and the dust-fall record from eastern China, but show no consistent relationship. The most prominent similarity between the reconstructed temperature histories for Dunde and Guliya is the marked warming of the last few decades. From the 1000a perspective provided be these ice-core records, the recent warming on Dunde is unique in its strength and persistence; however, the warming on Guliya (inferred from 18O enrichment) is more recent (since 1985) and not unprecedented. This recent warming over the Tibetan Plateau is evident in the limited meteorological records.

scholarly journals Decapitation of high-altitude glaciers on the Tibetan Plateau revealed by ice core tritium and mercury records

2015 ◽  
Vol 9 (1) ◽  
pp. 417-440 ◽  
Author(s):  
S. C. Kang ◽  
F. Y. Wang ◽  
U. Morgenstern ◽  
Y. L. Zhang ◽  
B. Grigholm ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Mass Balance ◽  
Ice Core ◽  
Ice Cores ◽  
The Tibetan Plateau ◽  
Runoff Water ◽  
Sea Levels ◽  
In Situ Data ◽  
Ice Accumulation ◽  
Glacier Ice

Abstract. Two ice cores were retrieved from high elevations (~ 5800 m a.s.l.) at Mt. Nyainqentanglha and Mt. Geladaindong in the southern to inland Tibetan Plateau. The combined analysis of tritium (3H), 210Pb, mercury tracers, along with other chemical records, revealed that the two coring sites had not received net ice accumulation since at least the 1950s and 1980s, respectively, implying an annual ice loss rate of more than several hundred millimeter water equivalent over these periods. Both mass balance modeling at the sites and in situ data from nearby glaciers confirmed a continuously negative mass balance (or mass loss) in the region due to the dramatic warming in the last decades. Along with a recent report on Naimona'nyi Glacier in the Himalaya, the findings suggest that glacier decapitation (i.e., the loss of the accumulation zone) is a wide-spread phenomenon from the southern to inland Tibetan Plateau even at the summit regions. This raises concerns over the rapid rate of glacier ice loss and associated changes in surface glacier runoff, water availability, and sea levels.

scholarly journals Mineralogical and morphological properties of individual dust particles in ice cores from the Tibetan Plateau

2016 ◽  
Vol 62 (231) ◽  
pp. 46-53 ◽  
Author(s):  
GUANGJIAN WU ◽  
XUELEI ZHANG ◽  
CHENGLONG ZHANG ◽  
TIANLI XU
Keyword(s):  
Tibetan Plateau ◽  
Aspect Ratio ◽  
Morphological Characteristics ◽  
Ice Cores ◽  
Morphological Properties ◽  
Dust Particles ◽  
The Tibetan Plateau ◽  
Ratio Distribution ◽  
Northern Tibetan Plateau ◽  
The Individual

ABSTRACTUsing a field emission scanning electron microscope and energy-dispersive X-ray spectrometer (FESEM−EDS), individual insoluble dust particles in ice cores recovered from the northern (Dunde), western (Muztagata) and south-eastern (Palong-Zangbo) Tibetan Plateau were analysed in order to reveal the mineralogical and morphological characteristics of the analogue of long-range transported Asian dust. The results reveal that the dust particles are mainly composed of quartz (17–36%, number abundance), clay (37–48%) and feldspar (12–18%). Illite and chlorite are the dominant clay species, while kaolinite is rarely observed. For the three sites, regional differences in the mineral assemblages are significant, in particular the abundance of quartz, chlorite and muscovite species, reflecting the regional provenance of these dust particles and the climatic regime in their source areas. Oxide ratios in clays indicate different weathering strengths of the particles in their source regions, with a higher K2O/(SiO2 + Al2O3) in the western and northern Tibetan Plateau. The individual particles have modes of 1.48 and 1.53 in the aspect ratio and circularity distribution respectively. No significant relationship between aspect ratio and circularity was found. Quartz and feldspar particles have a narrow aspect ratio distribution. Muscovite particles have the coarsest grain size, while chlorite particles have the finest.

δ 18O record and temperature change over the past 100 years in ice cores on the Tibetan Plateau

2006 ◽  
Vol 49 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Tandong Yao ◽  
Xuejun Guo ◽  
Lonnie Thompson ◽  
Keqin Duan ◽  
Ninglian Wang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Temperature Change ◽  
Ice Cores ◽  
The Tibetan Plateau ◽  
The Past

scholarly journals 1000 years of climatic change in China: ice-core δ18O evidence

1995 ◽  
Vol 21 ◽  
pp. 189-195 ◽  
Author(s):  
P. N. Lin ◽  
L.G. Thompson ◽  
M.E. Davis ◽  
E. Mosley-Thompson
Keyword(s):  
Tibetan Plateau ◽  
Eastern China ◽  
Ice Core ◽  
Empirical Relationship ◽  
Ice Cores ◽  
Western China ◽  
The Tibetan Plateau ◽  
Ice Caps ◽  
Recent Warming ◽  
Reconstructed Temperature

Since 1987, ice cores have been drilled from the Dunde and Guliya ice caps on the Tibetan Plateau, western China. Here, the oxygen isotopic (δ18O) records for the last 1000 years from both these cores are compiled and compared. Using surface temperature observations since the mid-1960s from meteorological stations on the plateau and δ18O measured on precipitation collected contemporaneously, the empirical relationship: δ18O = 0.6 Ts – 12 is established. δ18O appears to serve as a reasonable proxy for regional surface temperatures and a reasonable basis for reconstructing 1000a proxy temperature records from Dunde and Guliya. The reconstructed temperature histories for Dunde (on the eastern Tibetan Plateau) and Guliya (on the western Tibetan Plateau) show some centennial-scale similarities, but reveal quite different histories for higher-frequency variability over the last millennium. The ice-core δ18O histories from Dunde and Guliya are compared with a tree-ring index from western China and the dust-fall record from eastern China, but show no consistent relationship. The most prominent similarity between the reconstructed temperature histories for Dunde and Guliya is the marked warming of the last few decades. From the 1000a perspective provided be these ice-core records, the recent warming on Dunde is unique in its strength and persistence; however, the warming on Guliya (inferred from 18O enrichment) is more recent (since 1985) and not unprecedented. This recent warming over the Tibetan Plateau is evident in the limited meteorological records.

scholarly journals Re-evaluating black carbon in the Himalayas and the Tibetan Plateau: concentrations and deposition

2017 ◽  
Vol 17 (19) ◽  
pp. 11899-11912 ◽  
Author(s):  
Chaoliu Li ◽  
Fangping Yan ◽  
Shichang Kang ◽  
Pengfei Chen ◽  
Xiaowen Han ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Atmospheric Deposition ◽  
Black Carbon ◽  
Ice Cores ◽  
Lake Basin ◽  
The Tibetan Plateau ◽  
Nam Co ◽  
Deposition Rates ◽  
Study Region ◽  
Lake Cores

Abstract. Black carbon (BC) is the second most important warming component in the atmosphere after CO2. The BC in the Himalayas and the Tibetan Plateau (HTP) has influenced the Indian monsoon and accelerated the retreat of glaciers, resulting in serious consequences for billions of Asian residents. Although a number of related studies have been conducted in this region, the BC concentrations and deposition rates remain poorly constrained. Because of the presence of arid environments and the potential influence of carbonates in mineral dust (MD), the reported BC concentrations in the HTP are overestimated. In addition, large discrepancies have been reported among the BC deposition derived from lake cores, ice cores, snow pits and models. Therefore, the actual BC concentration and deposition values in this sensitive region must be determined. A comparison between the BC concentrations in acid (HCl)-treated and untreated total suspected particle samples from the HTP showed that the BC concentrations previously reported for the Nam Co station (central part of the HTP) and the Everest station (northern slope of the central Himalayas) were overestimated by approximately 52 ± 35 and 39 ± 24 %, respectively, because of the influence of carbonates in MD. Additionally, the organic carbon (OC) levels were overestimated by approximately 22 ± 10 and 22 ± 12 % for the same reason. Based on previously reported values from the study region, we propose that the actual BC concentrations at the Nam Co and Everest stations are 61 and 154 ng m−3, respectively. Furthermore, a comprehensive comparison of the BC deposition rates obtained via different methods indicated that the deposition of BC in HTP lake cores was mainly related to river sediment transport from the lake basin as a result of climate change (e.g., increases in temperature and precipitation) and that relatively little BC deposition occurred via atmospheric deposition. Therefore, previously reported BC deposition rates from lake cores overestimated the atmospheric deposition of BC in the HTP. Correspondingly, BC deposition derived from snow pits and ice cores agreed well with that derived from models, implying that the BC depositions of these two methods reflect the actual values in the HTP. Therefore, based on reported values from snow pits and ice cores, we propose that the BC deposition in the HTP is 17. 9 ± 5. 3 mg m−2 a−1, with higher and lower values appearing along the fringes and central areas of the HTP, respectively. These adjusted BC concentrations and deposition values in the HTP are critical for performing accurate evaluations of other BC factors, such as atmospheric distribution, radiative forcing and chemical transport in the HTP.

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