北疆冰雪运动气候适宜性及其变化特征     

李淑娟  毛炜峄  陈静  姚俊强  李建刚  迪丽努尔&#x  托列吾别克 《气候变化研究进展》2021,17(5):537-547

基于北疆43站的降雪量、日平均气温、日最高气温以及日平均风速等资料,应用冰雪运动气候适宜性指数(ISCI),对1961—2017年冬春季北疆的冰雪运动适宜性及其变化特征进行评估,结果如下：(1)北疆大部分站点都适宜开展冰雪运动,阿勒泰等地最为适宜,但伊犁河谷大部分站点、阿拉山口与达坂城等地适宜程度相对较低。(2)冰雪运动气候适宜程度与降雪量并非线性关系,北疆冬春季区域平均降雪量越大,很适宜与不适宜开展冰雪运动的站点都越多。海拔在1200 m以上的站点均适宜开展冰雪运动。(3) ISCI指数的年际差异明显,区域平均ISCI指数随时间推进而减小,但不同站点的ISCI指数线性变化趋势有升有降。1998—2017年期间,北疆适宜冰雪运动的站点较之前大范围减少。(4)阿勒泰地区各站在所有时间阶段中均适宜开展冰雪运动,尤其是阿勒泰北部,冰雪运动气候适宜程度呈阶段性增大,而伊犁河谷大部分站点的冰雪运动适宜程度整体呈阶段性减小。  相似文献   

Distribution of Lg coda <Emphasis Type="Italic">Q</Emphasis> in Xinjiang and its adjacent regions     

Xu Yan  Mao Yan  Hu Jia-fu  Su You-jin  Cong Lian-li 《地震科学（英文版）》2005,18(2):162-170

In this study, we collected 1 156 broadband vertical components records at 22 digital seismic stations in Xinjiang region, Ürümqi station, and 7 stations in the adjacent regions during the period of 1999–2003. The records were firstly processed by the stacked spectral ratio method to obtain Q ₀ (Q at 1 Hz) and the frequency correlation factor η corresponding to each path. Based on the results, the distribution images of Q ₀ and η in 1°×1° grids for Xinjiang region were gained by the back-projection technique. The results indicate that Q ₀ is high (300–450) in the Tarim platform and marginal Siberian platform, while Q ₀ is low (150–250) in the southern regions as west Kunlun fold system and Songpan-Ganzi fold system. In the northern regions as Junggar fold system and Tianshan fold system, Q ₀ is also low (250–300) and η varies between 0.5 and 0.9.  相似文献   

Phonon density of states in iron at high pressures and high temperatures     

G. ?ShenEmail author  W. ?Sturhahn  E. E. ?Alph  J. ?Zhao  T. S. ?Tollenner  V. B. ?Prakapenka  Y. ?Meng  H.-R. ?Mao 《Physics and Chemistry of Minerals》2004,31(6):353-359

The phonon density of states (DOS) in iron has been measured in situ by nuclear resonance inelastic X-ray scattering (NRIXS) at high pressures and high temperatures in a resistively heated diamond anvil cell. The DOS data provide a variety of thermodynamic and elastic parameters essential for characterizing iron at depth in the Earth interior, such as average sound velocity, Debye temperature, atomic mean square displacement, average kinetic energy, vibrational entropy and specific heat. The NRIXS data were collected at 6, 20, and 29 GPa and at temperatures up to 920 K. Temperatures were directly determined from the measured spectra by the ratio of intensities of the phonon creation/annihilation side bands that are determined only by the Boltzmann factor. The change of the DOS caused by the structural transition from -Fe to -Fe is small and not resolvable within the experimental precision. However, the phonon energies in -Fe are clearly shifted to lower values with respect to - and -Fe. The temperature dependence of derived thermodynamic parameters is presented and compared with those obtained by Debyes model. The Debye temperatures that best describe the data decrease slightly with increasing temperature.  相似文献   

The basic features of zooplankton in the western waters of Taiwan Strait     

Cai Bingji  Lian fiuangshan  Lin Yuhui  Lin Mao  Dai Yanyu  Liu Jinghong  Chen Ruixiang 《海洋学报(英文版)》1996,15(1):139-144

ＴｈｅｂａｓｉｃｆｅａｔｕｒｅｓｏｆｚｏｏｐｌａｎｋｔｏｎｉｎｔｈｅｗｅｓｔｅｒｎｗａｔｅｒｓｏｆＴａｉｗａｎＳｔｒａｉｔＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｅｓｓａｙｕｓｅｓｔｈｅｄａｔａｆｒｏｍａｃｏｍｐｒｅｈｅｎｓｉｖｅｓｕｒｖｅｙｃａｒｒｉｅｄｏｕ...  相似文献   

Distribution and ecological aspects of the Siphonophora in the middle of South China Sea     

Lin Mao 《海洋学报(英文版)》1993,12(2):317-322

This paper reports species composition, horizontal distribution and seasonal variation of total individual and dominant species of the Siphonophora and their relationship to the environmental factors. Materials from the water layers within 0～200 m were collected during the periods of September, 1983, April and May, July and August, and December, 1984 in the study region (12°-19°30′N, 111°-118°E, Fig. 1).  相似文献   

六线鳚(Ernogrammus hexagrammus(Temminck et Schlegel))染色体组型     

毛连菊  杨良宾  秦克静 《中国海洋大学学报(自然科学版)》1993,(4)

用六线鳚脾脏为材料研究其染色体组型,2n=48,NF=48,全部为端部着丝点染色体。  相似文献   

On a new species of deep-water Siphonophora, Lensia multicristoides sp. nov. from middle South China Sea     

Zhang Jinbiao  Lin Mao 《海洋学报(英文版)》1988,7(1):115-118

-In this paper, a new species of deep-water Siphonophora, Lensia multicristoides sp. nov., collected from the middle South China Sea is described and compared with some similar species in the genus.  相似文献   

台湾海峡西部海域水螅水母类和管水母类的垂直分布   总被引：4，自引：0，他引：4  

张金标  林茂 《台湾海峡》2001,20(1):1-8

本文报道了台湾海峡西部海域夏、秋季水螅水母类和管水母类的垂直分布，结果表明：这两类浮游动物的种类数一般以中层（10－25m）和上层（0－10m）居多，而平均丰度则以上层最大，这主要是由于主要种四叶小舌水母、两手筐水母、双生水母和长囊无棱水母多栖息于上层之故。本文还讨论了这两类水母垂直分布的类型及与水温、光强和铒料的关系。  相似文献   

长江河口最大浑浊带含沙量垂线分布状态的分析   总被引：2，自引：0，他引：2  

贺松林  茅志昌 《海洋湖沼通报》1993,(3):21-27

计算表明,潮泵效应在长江河口最大浑浊带悬沙输移中起着重要的作用。含沙量垂线分布的潮周期变化反映悬沙与床沙之间存在双向交换。据此讨论了最大浑浊带与拦门沙的关系。  相似文献   

11种天然药物对弧菌的体外抑制效果的观察   总被引：15，自引：0，他引：15  

王雷  李光友  毛远兴 《海洋与湖沼》1995,26(3):338-340

于１９９１年３－４月应用纸片法定量测定了海洋及陆地来源的１１种天然药物提取物地中国对虾的主要致病菌－弧菌的体外抑制效果，结果表明，对弧菌高度敏感的药物有５种，中度敏感的药物有３种，不敏感药物有３种，并且５种高度敏感药物的抑菌效果均优于绝大多数抗菌素。为在对虾养殖中选择高效，低毒的天然抗菌药物提供科学依据。  相似文献