Interdecadal Variability of East Asian Summer Monsoon Precipitation over 220 Years （1777-1997）   总被引：1，自引：1，他引：0  

Chun-Ji KIM  QIAN Weihong  Hyun-Suk KANG  Dong-Kyou LEE 《大气科学进展》2010,27(2):253-264

In this study, long-term (1777–1997) precipitation data for Seoul, Korea, wetness indices from eastern China, and modern observations are used to identify the interdecadal variability in East Asian summer monsoon precipitation over the last 220 years. In the East Asian monsoon region, two long-term timescales of dry–wet transitions for the interdecadal variability and quasi-40-and quasi-60-year timescales are dominant in the 220-year precipitation data of Seoul, as well as in the wetness indices over China....  相似文献   

A Closure Study of Aerosol Hygroscopic Growth Factor during the 2006 Pearl River Delta Campaign   总被引：3，自引：0，他引：3  

LIU Xingang  ZHANG Yuanhang  WEN Mengting  WANG Jingli  Jinsang JUNG  CHANG Shih-yu  HU Min  ZENG Limin  Young Joon KIM 《大气科学进展》2010,27(4):947-956

Measurements of aerosol physical, chemical and optical parameters were carried out in Guangzhou, China from 1 July to 31 July 2006 during the Pearl River Delta Campaign. The dry aerosol scattering coefficient was measured using an integrating nephelometer and the aerosol scattering coefficient for wet conditions was determined by subtracting the sum of the aerosol absorption coefficient, gas scattering coefficient and gas absorption coefficient from the atmospheric extinction coefficient. Following this, the aerosol hygroscopic growth factor, f(RH), was calculated as the ratio of wet and dry aerosol scattering coefficients. Measurements of size-resolved chemical composition, relative humidity (RH), and published functional relationships between particle chemical composition and water uptake were likewise used to find the aerosol scattering coefficients in wet and dry conditions using Mie theory for internally- or externally-mixed particle species [(NH₄)₂SO₄, NH₄NO₃, NaCl, POM, EC and residue]. Closure was obtained by comparing the measured f(RH) values from the nephelometer and other in situ optical instruments with those computed from chemical composition and thermodynamics. Results show that the model can represent the observed f(RH) and is appropriate for use as a component in other higher-order models.  相似文献   

Leaf area index is the principal scaling parameter for both gross photosynthesis and ecosystem respiration of Northern deciduous and coniferous forests   总被引：1，自引：0，他引：1  

ANDERS LINDROTH  FREDRIK LAGERGREN  MIKA AURELA  BRYNHILDUR BJARNADOTTIR  TORBEN CHRISTENSEN  EBBA DELLWIK  ACHIM GRELLE  REAS IBROM  TORBJÖRN JOHANSSON  HARRY LANKREIJER  SAMULI LAUNIAINEN  TUOMAS LAURILA  MEELIS MÖLDER  EERO NIKINMAA  KIM PILEGAARD  BJARNI D. SIGURDSSON  TIMO VESALA 《Tellus. Series B, Chemical and physical meteorology》2008,60(2):129-142

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Ternary forecast of heavy snowfall in the Honam area,Korea     

Keon Tae SOHN  Jeong Hyeong LEE  Young Seuk CHO 《大气科学进展》2009,26(2):327-332

The objective of this study is to improve the statistical modeling for the ternary forecast of heavy snowfall in the Honam area in Korea. The ternary forecast of heavy snowfall consists of one of three values, 0 for less than 50 mm, 1 for an advisory (50–150 mm), and 2 for a warning (more than 150 mm). For our study, the observed daily snow amounts and the numerical model outputs for 45 synoptic factors at 17 stations in the Honam area during 5 years (2001 to 2005) are used as observations and potential pre...  相似文献   

不对称环流对台风强度变化的影响   总被引：6，自引：0，他引：6  

河惠卿  王振会  金正润 《热带气象学报》2008,24(3):249-253

利用卫星云图和NCEP再分析风场资料对0207号台风HALONG云系和风场变化特征进行了分析.结果表明,台风云系不对称的结构,台风西侧高空急流向台风中心的移动和辐散是台风迅速减弱的主要原因.为了了解不对称台风环流对台风强度的影响,还对比分析了0417号台风AERE、0216号台风SINLAKU在中国沿海减弱和重新加强的环流特征.在低层流入台风中心南侧的西风分量大,在高层流入台风中心西侧的北风分量小,有利于台风的加强.台风南、北两侧的东西向风场垂直切变梯度差异不利于台风加强.东西向风场垂直切变对台风强度的影响比南北向风场更重要.  相似文献   

The kinematics of the Seyfert 2 galaxy NGC 5728 circumnuclear region     

D.-H. Son  S. Hyung  P. Ferruit  E. Pécontal  W.-B. Lee 《Monthly notices of the Royal Astronomical Society》2009,395(2):692-718

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Risk Analysis of Breakwater Caisson Under Wave Attack Using Load Surface Approximation     

Dong Hyawn KIM 《中国海洋工程》2014,(6):739-748

A new load surface based approach to the reliability analysis of caisson-type breakwater is proposed. Uncertainties of the horizontal and vertical wave loads acting on breakwater are considered by using the so-called load surfaces, which can be estimated as functions of wave height, water level, and so on. Then, the first-order reliability method（FORM） can be applied to determine the probability of failure under the wave action. In this way, the reliability analysis of breakwaters with uncertainties both in wave height and in water level is possible. Moreover, the uncertainty in wave breaking can be taken into account by considering a random variable for wave height ratio which relates the significant wave height to the maximum wave height. The proposed approach is applied numerically to the reliability analysis of caisson breakwater under wave attack that may undergo partial or full wave breaking.  相似文献   

乌兹别克斯坦入境旅游者行为差异研究     

左冰  Olga Kim 《世界地理研究》2017,(3):147-156

随着旅游活动的全球化,跨文化旅游者的消费行为成为学界关注的热点问题。本文以地处丝绸之路黄金节点的乌兹别克斯坦为案例地,通过深入调研,分析了不同文化类别国家的旅游者在乌兹别克斯坦的旅游行为和感知差异,并借用霍夫斯泰德的文化差异理论对其进行解释。研究发现:(1)乌兹别克入境旅游者普遍年龄比较大,受教育水平高,停留时间长,更愿意花钱,并想获得真正的深度体验,寻找真实性;(2)不同文化类别游客在旅游目的、旅行方式、停留时间、游览空间等方面具有不同特征;(3)西方游客以精神性体验为主,关注文化体验和建筑,并希望在旅途中找到快乐;俄罗斯游客以世俗体验为主,追求休闲和美食;亚洲游客则两者兼而有之,表现为重视与本族群的关系、景点的文化价值和关心服务质量。研究对于了解丝绸之路旅游者的消费特征,推动中乌旅游合作和丝绸之路旅游发展具有重要意义。  相似文献   

SHRIMP U–Pb ages of detrital zircons from the Early Cretaceous Nakdong Formation,South East Korea: Timing of initiation of the Gyeongsang Basin and its provenance          下载免费PDF全文

Tae‐Ho Lee  Kye‐Hun Park  Keewook Yi 《Island Arc》2018,27(5)

To constrain the depositional age of the lowermost Nakdong Formation in the Early Cretaceous Gyeongsang Basin, SHRIMP U–Pb age determination was carried out on zircon separates. The U–Pb compositions of detrital zircons from the Nakdong Formation yield a wide range of ages from the Archean to the Cretaceous but show a marked contrast in age distribution according to the geographical locations within the basin. The provenance of the southern Nakdong Formation is dominantly the surrounding Yeongnam Massif, which is composed of Paleoproterozoic metamorphic rocks and Triassic to Jurassic plutonic rocks, whereas the central to northern Nakdong Formation records significant sediment derivation from the Okcheon Metamorphic Belt, which is distributed to the northwest, in addition to the contribution from the Yeongnam Massif. It is suggested that the maximum depositional age of the Nakdong Formation is ca 127 Ma, based on its youngest detrital zircon age population. The onset of its deposition at 127 Ma coincided with the tectonic inversion in East Asia from a compressional to an extensional geodynamic setting, probably due to the contemporaneous change in the drift direction of the Izanagi Plate and its subsequent oblique subduction.  相似文献   

Near-surface soil stabilization by enzyme-induced carbonate precipitation for fugitive dust suppression     

Song  Jun Young  Sim  Youngjong  Jang  Jaewon  Hong  Won-Taek  Yun  Tae Sup 《Acta Geotechnica》2020,15(7):1967-1980

Acta Geotechnica - To resolve the environmental and sustainability issues from fugitive dust emission and conventional mitigation methods, multiple experiments were conducted to evaluate the...  相似文献