Numerical simulation and evaluation of Asian dust events observed in Mongolia in spring 2011     

Eun-Hee Lee  Erdenebayar Munkhtsetseg  Seung-Bum Kim  Jong-Chul Ha  Sang-Sam Lee  Youngsin Chun 《Asia-Pacific Journal of Atmospheric Sciences》2013,49(1):111-120

The Asian dust forecasting model, Mongolian Asian Dust Aerosol Model (MGLADAM), has been operated by the National Agency for Meteorology and Environmental Monitoring of Mongolia since 2010, for the forecast of Asian dust storms. In order to evaluate the performance of the dust prediction model, we simulated Asian dust events for the period of spring 2011. Simulated features were compared with observations from two sites in the dust source region of the Gobi desert in Mongolia, and in the downstream region in Korea. It was found that the simulated wind speed and friction velocity showed a good correlation with observations at the Erdene site (one of the sites in the Gobi desert). The results show that the model is proficient in the simulation of dust concentrations that are within the same order of magnitude and have similar start and end times, compared with PM₁₀ observed at two monitoring sites in the Gobi regions. Root Mean Square Error (RMSE) of the dust simulation ranges up to 200 μg m^?3 because of the high concentrations in source regions, which is three times higher than that in the downstream region. However, the spatial pattern of dust concentration matches well with dust reports from synoptic observation. In the downwind regions, it was found that the model simluated all reported dust cases successfully. It was also found that the RMSE in the downwind region increased when the model integration time increased, but that in the source regions did not show consistent change. It suggests that MGLADAM has the potential to be used as an operational dust forecasting model for predicting major dust events over the dust source regions as well as predicting transported dust concentrations over the downstream region. However, it is thought that further improvement in the emission estimation is necessary, including accurate predictions in surface and boundary layer meteorology. In the downwind regions, background PM₁₀ concentration is considerably affected by other aerosol species, suggesting that a consideration of anthropogenic pollutants will be required for accurate dust forecasting.  相似文献   

Seasonal variation of carbon dioxide fluxes over irrigated soybean (Glycine max L.)     

Levent Şaylan  Reiji Kimura  Erdenebayar Munkhtsetseg  Makio Kamichika 《Theoretical and Applied Climatology》2011,105(1-2):277-286

In this study, variations in carbon dioxide (CO₂) fluxes resulting from gross primary production (GPP), net ecosystem exchange (NEE), and respiration (R _e) of soybean (Glycine max L.) were investigated by the Eddy Covariance method during the growing period from June to November 2005 on an irrigated sand field at the Arid Land Research Center, Tottori University in Tottori, Japan. Although climatic conditions were humid and temperate, the soybeans required frequent irrigation because of the low water holding capacity of the sandy soil at the field site. Finally, it has been found that the accumulated NEE, GPP, and R _e fluxes of soybean over 126 days amount to ?93, 319, and 226 gC m^?2, respectively. Furthermore, the average ratio of GPP to R _e was 1.4 and the average ratio of NEE to GPP was about ?0.29 for the growth period of soybean. Daily maximum NEE of ?3.8 gC m^?2 occurred when LAI was 1.1.  相似文献   

Modeling permafrost distribution over the river basins of Mongolia using remote sensing and analytical approaches     

Zorigt  Munkhtsetseg  Myagmar  Khulan  Orkhonselenge  Alexander  van Beek  Eelco  Kwadijk  Jaap  Tsogtbayar  Jargaltulga  Yamkhin  Jambaljav  Dechinlkhundev  Dorjsuren 《Environmental Earth Sciences》2020,79(12):1-1

The Editors-in-Chief of Environmental Earth Sciences are issuing an editorial expression of concern to alert readers that this article.  相似文献   

Depositional ages and characteristics of Middle–Upper Jurassic and Lower Cretaceous lacustrine deposits in southeastern Mongolia          下载免费PDF全文

Hitoshi Hasegawa  Hisao Ando  Noriko Hasebe  Niiden Ichinnorov  Tohru Ohta  Takashi Hasegawa  Masanobu Yamamoto  Gang Li  Bat‐Orshikh Erdenetsogt  Ulrich Heimhofer  Takayuki Murata  Hironori Shinya  G. Enerel  G. Oyunjargal  O. Munkhtsetseg  Noriyuki Suzuki  Tomohisa Irino  Koshi Yamamoto 《Island Arc》2018,27(3)

Lower Cretaceous lacustrine oil shales are widely distributed in southeastern Mongolia. Due to the high organic carbon content of oil shale, many geochemical studies and petroleum exploration have been conducted. Although most of the oil shales are considered to be Early Cretaceous in age, a recent study reveals that some were deposited in the Middle Jurassic. The present study aims at establishing depositional ages and characteristics of the Jurassic and Cretaceous lacustrine deposits in Mongolia. The Lower Cretaceous Shinekhudag Formation is about 250 m thick and composed of alternating beds of shale and dolomite. The Middle Jurassic Eedemt Formation is about 150 m thick and composed of alternating beds of shale, dolomitic marl, and siltstone. The alternations of shale and dolomite in both formations were formed by lake level changes, reflecting precipitation changes. Shales were deposited in the center of a deep lake during highstand, while dolomites were formed by primary precipitation during lowstand. Based on the radiometric age dating, the Shinekhudag Formation was deposited between 123.8 ±2.0 Ma and 118.5 ±0.9 Ma of the early Aptian. The Eedemt Formation was deposited at around 165–158 Ma of Callovian–Oxfordian. The calculated sedimentation rate of the Shinekhudag Formation is between 4.7 ±2.6 cm/ky and 10.0 ±7.6 cm/ky. Shales in the Shinekhudag Formation show micrometer‐scale lamination, consisting of algal organic matter and detrital clay mineral couplets. Given the average thickness of micro‐laminae and calculated sedimentation rate, the micro‐lamination is most likely of varve origin. Both Middle–Upper Jurassic and Lower Cretaceous lacustrine oil shales were deposited in intracontinental basins in the paleo‐Asian continent. Tectonic processes and basin evolution basically controlled the deposition of these oil shales. In addition, enhanced precipitation under humid climate during the early Aptian and the Callovian–Oxfordian was another key factor inducing the widespread oil shale deposition in Mongolia.  相似文献   

Estimating thawing depths and mean annual ground temperatures in the Khuvsgul region of Mongolia     

Munkhtsetseg Zorigt  Jaap Kwadijk  Eelco Van Beek  Scott Kenner 《Environmental Earth Sciences》2016,75(10):897

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Site selection for water harvesting ponds using spatial multi-criteria analysis in a region with fluctuating climate     

Altansukh Ochir  Munkhtsetseg Zorigt  Solongo Tsetsgee  John Lodewijk van Genderen 《国际地球制图》2018,33(7):699-712

The purpose of this research was to identify suitable sites for water harvesting ponds using spatial multi-criteria analysis (SMCA). In total, 12 spatial data-sets were used for this research, 14 criteria have been selected for defining a proper sink, and each of these criteria is converted into the common scale differently based on whether one is a constraint or a factor. The defined sinks were evaluated by nine constraints and five factors analysis, sequentially. At the end of the factor analysis, the proper sinks were divided into four classes, namely: unsuitable, marginally, moderately and highly suitable. Ground truth observation was carried at randomly selected 13 proper sinks. Overall accuracy of site selection for water harvesting ponds using SMCA was 92.3%. Due to the very different natural zones and fluctuating climate of Mongolia, spatial factors for SMCA were standardized instead of using interval divisions.  相似文献