New Discovery of Surface Rupture of Large Paleo-Earthquake along Northern Pagri-Duoqing Co Graben, Southern Yadong-Gulu Rift     

HA Guanghao  WU Zhonghai  GAI Hailong  ZUO Jiameng 《《地质学报》英文版》2019,93(4):1135-1136

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Initial Rifting Age of the Nearly N–S Rifts in Southern Tibetan Plateau: New Evidence from the Age limit of the Early Sediments     

HA Guanghao  WU Zhonghai  HE Lin  WANG Shubing 《《地质学报》英文版》2017,91(2):739-740

<正>Objective The nearly parallel N–S-trending rifts in southern Tibet represent the E–W extension of the Tibet Plateau.Most data which constrained the age of the extensional deformation come from isotopic dating of the dikes probably related to the activity of the nearly N–S faulting and micas from hydrothermal activity and the lowtemperature thermochronology of plateau uplift.Previous  相似文献   

Baseline data of polycyclic aromatic hydrocarbons correlation to size of marine organisms harvested from a war-induced oil spill zone of the Eastern Mediterranean Sea     

Barbour EK  Sabra AH  Shaib HA  Berckley AM  Farajalla NS  Zurayk RA  Kassaify ZG 《Marine pollution bulletin》2008,56(4):770-777

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A Climatological Perspective on Extratropical Synoptic-Scale Transient Eddy Activity Response to Western Pacific Tropical Cyclones     

Yao HA  Zhong ZHONG  Haikun ZHAO  Yimin ZHU  Yao YAO  Yijia HU 《大气科学进展》2022,39(2):333-343

An observational study focusing on the contribution of tropical cyclones(TCs)that form over the western North Pacific(WNP)to the synoptic-scale transient eddy activity(STEA)over the North Pacific during the boreal autumn and early winter in the period 1979–2019 is presented in this paper.Statistical results show that WNP TCs entering the midlatitudinal North Pacific provide significant positive effects on the pentad mean strength of STEA,which is primarily concentrated over the Kuroshio/Oyashio Extensions(KOE)and regions from east of Japan to 160°W in the lower and midto-upper troposphere,respectively.TC intensity is highly indicative of the subsequent STEA with a correlation coefficient of 0.37/0.33/0.45 at 300 hPa/500 hPa/850 hPa exceeding the 99%confidence level for the period 1979–2019.The strength of STEA in the upper troposphere associated with TCs presents a more significant linear growth with TC intensity than that at the mid-to-lower levels after the cyclones enter the KOE region,suggesting that the impact of TCs on STEA gradually increases with height.Further analyses reveal that the contribution of TCs accounts for 4%–6%of the total STEA change over the KOE region during the late autumn and early winter.In addition,the influence of TCs on STEA experienced an interdecadal decrease from the early 2000 s through the early 2010 s.  相似文献   

The effect of the earth's rotation on ground water motion     

Loáiciga HA 《Ground water》2007,45(1):98-100

The average pore velocity of ground water according to Darcy's law is a function of the fluid pressure gradient and the gravitational force (per unit volume of ground water) and of aquifer properties. There is also an acceleration exerted on ground water that arises from the Earth's rotation. The magnitude and direction of this rotation-induced force are determined in exact mathematical form in this article. It is calculated that the gravitational force is at least 300 times larger than the largest rotation-induced force anywhere on Earth, the latter force being maximal along the equator and approximately equal to 34 N/m(3) there. This compares with a gravitational force of approximately 10(4) N/m(3).  相似文献   

Impacts of a fuel oil spill on seagrass meadows in a subtropical port, Gladstone, Australia--the value of long-term marine habitat monitoring in high risk areas     

Taylor HA  Rasheed MA 《Marine pollution bulletin》2011,63(5-12):431-437

We used an established seagrass monitoring programme to examine the short and longer-term impacts of an oil spill event on intertidal seagrass meadows. Results for potentially impacted seagrass areas were compared with existing monitoring data and with control seagrass meadows located outside of the oil spill area. Seagrass meadows were not significantly affected by the oil spill. Declines in seagrass biomass and area 1month post-spill were consistent between control and impact meadows. Eight months post-spill, seagrass density and area increased to be within historical ranges. The declines in seagrass meadows were likely attributable to natural seasonal variation and a combination of climatic and anthropogenic impacts. The lack of impact from the oil spill was due to several mitigating factors rather than a lack of toxic effects to seagrasses. The study demonstrates the value of long-term monitoring of critical habitats in high risk areas to effectively assess impacts.  相似文献   

Snowstorm over the Southwestern Coast of the Korean Peninsula Associated with the Development of Mesocyclone over the Yellow Sea   总被引：1，自引：0，他引：1  

Ki-Young HEO  Kyung-Ja HA 《大气科学进展》2008,25(5):765-777

This study investigates the characteristics of a heavy snowfall event over the southwestern part of the Korean Peninsula on 4 December 2005. The snowstorm was a type of mesoscale maritime cyclone which resulted from barotropic instability, and diabatic heating from the warm ocean in continental polar air masses. Based on surface observations, radiosonde soundings, MTSAT-1R satellite data and the 10-km grid RDAPS （Regional Assimilation and Prediction System based on the PSU/NCAR MM5） data, the evolution of the mesocyclone is explained by the following dynamics; （1） In the initial stage, the primary role in the cyclogenesis process of the mesocyclone is a barotropic instability in the horizontal shear zone. （2） In the developing stage, the mesocyclone moves and deepens into a baroclinic zone corresponding to the surface heating and moistening. （3） In the mature stage, it is found that the mesocyclone is intensified by the destabilization caused by enhanced low-level heating and condensation, the moisture flux convergence, and the interaction between upper and lower-level potential vorticity anomalies. We suggest that a checklist with stepwise indicators responsible for development be prepared for the forecasting of heavy snowfall over the southwestern part of the Korean Peninsula.  相似文献   

环境对生物成矿作用的影响     

Lowe.  HA 李大庆 《国外地质(成都)》1992,(4):28-37

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The Dynamic and Thermodynamic Effects of Relative and Absolute Sea Surface Temperature on Tropical Cyclone Intensity   总被引：1，自引：0，他引：1       下载免费PDF全文

SUN Yuan  ZHONG Zhong  HA Yao  WANG Yuan  WANG Xiaodan 《Acta Meteorologica Sinica》2013,27(1):40-49

Several numerical experiments were performed to investigate the dynamic and thermodynamic effects of sea surface temperature(SST) on tropical cyclone(TC) intensity.The results reveal that the relative SST within a radius of 2-3 times the radius of maximum wind contributes positively and greatly to TC intensity,while the remote SST far away from the TC center could reduce storm intensity.The change of air-sea temperature and moisture differences may be the reason why TC intensity is more sensitive to the relative rather than the absolute SST.As the inflow air moves toward the eyewall,warmer(colder) remote SST can gradually increase(decrease) the underlying surface air temperature and moisture,and thus decrease(increase) the air-sea temperature and moisture differences,which lead to less(more) energy fluxes entering the eyewall and then decrease(increase) the TC intensity and make it less sensitive to the absolute SST change.Finally,with all the related dynamic and thermodynamic processes being taken into account,a schematic diagram for the effects of relative SST and absolute SST on TC intensity is proposed.  相似文献   

Evidence for equilibrium iron isotope fractionation by nitrate-reducing iron(II)-oxidizing bacteria     

Kappler A  Johnson CM  Crosby HA  Beard BL  Newman DK 《Geochimica et cosmochimica acta》2010,74(10):2826-1852

Iron isotope fractionations produced during chemical and biological Fe(II) oxidation are sensitive to the proportions and nature of dissolved and solid-phase Fe species present, as well as the extent of isotopic exchange between precipitates and aqueous Fe. Iron isotopes therefore potentially constrain the mechanisms and pathways of Fe redox transformations in modern and ancient environments. In the present study, we followed in batch experiments Fe isotope fractionations between Fe(II)_aq and Fe(III) oxide/hydroxide precipitates produced by the Fe(III) mineral encrusting, nitrate-reducing, Fe(II)-oxidizing Acidovorax sp. strain BoFeN1. Isotopic fractionation in ⁵⁶Fe/⁵⁴Fe approached that expected for equilibrium conditions, assuming an equilibrium Δ⁵⁶Fe_{Fe(OH)3-Fe(II)aq} fractionation factor of +3.0‰. Previous studies have shown that Fe(II) oxidation by this Acidovorax strain occurs in the periplasm, and we propose that Fe isotope equilibrium is maintained through redox cycling via coupled electron and atom exchange between Fe(II)_aq and Fe(III) precipitates in the contained environment of the periplasm. In addition to the apparent equilibrium isotopic fractionation, these experiments also record the kinetic effects of initial rapid oxidation, and possible phase transformations of the Fe(III) precipitates. Attainment of Fe isotope equilibrium between Fe(III) oxide/hydroxide precipitates and Fe(II)_aq by neutrophilic, Fe(II)-oxidizing bacteria or through abiologic Fe(II)_aq oxidation is generally not expected or observed, because the poor solubility of their metabolic product, i.e. Fe(III), usually leads to rapid precipitation of Fe(III) minerals, and hence expression of a kinetic fractionation upon precipitation; in the absence of redox cycling between Fe(II)_aq and precipitate, kinetic isotope fractionations are likely to be retained. These results highlight the distinct Fe isotope fractionations that are produced by different pathways of biological and abiological Fe(II) oxidation.  相似文献