Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-14799-2018 |
A new model of meteoric calcium in the mesosphere and lower thermosphere | |
Plane, John M. C.1; Feng, Wuhu1,2; Gomez Martin, Juan Carlos1,3; Gerding, Michael4; Raizada, Shikha5 | |
2018-10-16 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:20页码:14799-14811 |
文章类型 | Article |
语种 | 英语 |
国家 | England; Spain; Germany; USA |
英文摘要 | Meteoric ablation produces layers of metal atoms in the mesosphere and lower thermosphere (MLT). It has been known for more than 30 years that the Ca atom layer is depleted by over 2 orders of magnitude compared with Na, despite these elements having nearly the same elemental abundance in chondritic meteorites. In contrast, the Ca+ ion abundance is depleted by less than a factor of 10. To explain these observations, a large database of neutral and ion-molecule reaction kinetics of Ca species, measured over the past decade, was incorporated into the Whole Atmosphere Community Climate Model (WACCM). A new meteoric input function for Ca and Na, derived using a chemical ablation model that has been tested experimentally with a Meteoric Ablation Simulator, shows that Ca ablates almost 1 order of magnitude less efficiently than Na. WACCM-Ca simulates the seasonal Ca layer satisfactorily when compared with lidar observations, but tends to overestimate Ca+ measurements made by rocket mass spectrometry and lidar. A key finding is that CaOH and CaCO3 are very stable reservoir species because they are involved in essentially closed reaction cycles with O-2 and O. This has been demonstrated experimentally for CaOH, and in this study for CaCO3 using electronic structure and statistical rate theory. Most of the neutral Ca is therefore locked in these reservoirs, enabling rapid loss through polymerization into meteoric smoke particles, and this explains the extreme depletion of Ca. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000447607900001 |
WOS关键词 | POSITIVE-ION COMPOSITION ; EARTH SYSTEM MODEL ; UPPER-ATMOSPHERE ; LOWER IONOSPHERE ; CA+ LAYERS ; CHEMISTRY ; O-2 ; ELEMENTS ; SODIUM ; CO2 |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26181 |
专题 | 地球科学 |
作者单位 | 1.Univ Leeds, Sch Chem, Leeds LS2 9JT, W Yorkshire, England; 2.Univ Leeds, Sch Earth & Environm, Natl Ctr Atmospher Sci, Leeds LS2 9JT, W Yorkshire, England; 3.CSIC, IAA, E-18008 Granada, Spain; 4.Rostock Univ, Leibniz Inst Atmospher Phys, Schlossstr 6, D-18225 Kuhlungsborn, Germany; 5.SRI Int, Space & Atmospher Sci Dept, Arecibo Observ, Arecibo, PR 00612 USA |
推荐引用方式 GB/T 7714 | Plane, John M. C.,Feng, Wuhu,Gomez Martin, Juan Carlos,et al. A new model of meteoric calcium in the mesosphere and lower thermosphere[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(20):14799-14811. |
APA | Plane, John M. C.,Feng, Wuhu,Gomez Martin, Juan Carlos,Gerding, Michael,&Raizada, Shikha.(2018).A new model of meteoric calcium in the mesosphere and lower thermosphere.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(20),14799-14811. |
MLA | Plane, John M. C.,et al."A new model of meteoric calcium in the mesosphere and lower thermosphere".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.20(2018):14799-14811. |
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