中国科学院机构知识库网格系统: 检索

Determining whether hydrological processes drive carbon source and sink conversion shifts in a large floodplain-lake system in China 期刊论文 OAI收割
WATER RESEARCH, 2022, 卷号: 224, 页码: 12
作者: Wang, Shuoyue; Gao, Yang; Jia, Junjie; Lu, Yao; Wang, Jing

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收藏 | 浏览/下载：31/0 | 提交时间：2022/11/09

Partial pressure of carbon dioxide Water -air carbon exchange flux Carbon dioxide emission Carbon source Carbon sink Hydrological process

Determining whether hydrological processes drive carbon source and sink conversion shifts in a large floodplain-lake system in China 期刊论文 OAI收割
WATER RESEARCH, 2022, 卷号: 224, 页码: 12
作者: Wang, Shuoyue; Gao, Yang; Jia, Junjie; Lu, Yao; Wang, Jing

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收藏 | 浏览/下载：28/0 | 提交时间：2022/11/09

Partial pressure of carbon dioxide Water -air carbon exchange flux Carbon dioxide emission Carbon source Carbon sink Hydrological process

Ultra-wide Bandwidth Observations of 19 Pulsars with Parkes Telescope 期刊论文 OAI收割
Research in Astronomy and Astrophysics, 2022, 卷号: 22, 期号: 8, 页码: 85001
作者: Zhou, Zu-Rong; Wang, Jing-Bo; Wang, Na; Hobbs, George; Wang, Shuang-Qiang

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收藏 | 浏览/下载：18/0 | 提交时间：2023/06/19

(stars:) pulsars: general stars: neutron methods: data analysis flux-density measurements polarization discovery spectra polarimetry profiles emission Astronomy & Astrophysics

Hydrological seasonality and nutrient stoichiometry control dissolved organic matter characterization in a headwater stream 期刊论文 OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2022, 卷号: 807, 页码: 10
作者: Li, Siyue; Luo, Jiachen; Xu, Y. Jun; Zhang, Liuqing; Ye, Chen

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收藏 | 浏览/下载：57/0 | 提交时间：2021/12/23

Dissolved organic carbon Allochthonous and autochthonous DOM Headwater carbon flux Excitation emission matrix fluorescence Anthropogenic inputs Stoichiometric ratios

Evidence for Strong HONO Emission from Fertilized Agricultural Fields and its Remarkable Impact on Regional O-3 Pollution in the Summer North China Plain 期刊论文 OAI收割
ACS EARTH AND SPACE CHEMISTRY, 2021, 卷号: 5, 期号: 2, 页码: 340-347
作者: Xue, Chaoyang; Ye, Can; Zhang, Chenglong; Catoire, Valery; Liu, Pengfei

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收藏 | 浏览/下载：19/0 | 提交时间：2021/12/22

HONO nitrogen fertilization agricultural fields emission flux O-3

Study of the Urban NO2 Distribution and Emission Assessment Based on Mobile MAX-DOAS Observations 期刊论文 OAI收割
SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 卷号: 41
作者: Liu Hao-ran; Hu Qi-hou; Tan Wei; Su Wen-jing; Chen Yu-jia

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收藏 | 浏览/下载：22/0 | 提交时间：2021/04/26

Mobile MAX-DOAS NO2 Distribution Emission flux

Detection of Flare Multiperiodic Pulsations in Mid-ultraviolet Balmer Continuum, Lyl Hard X-Ray, and Radio Emissions Simultaneously 期刊论文 OAI收割
The Astrophysical Journal, 2021, 卷号: 921, 页码: 179
作者: HXMT

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收藏 | 浏览/下载：23/0 | 提交时间：2022/02/08

Solar flares Solar oscillations Solar ultraviolet emission Solar x-ray emission Solar radio emission 1496 1515 1533 1536 1522 Astrophysics - Solar and Stellar Astrophysics Abstract: Quasi-periodic pulsations (QPPs), which usually appear as temporal pulsations of the total flux, are frequently detected in the light curves of solar/stellar flares. In this study, we present the investigation of nonstationary QPPs with multiple periods during the impulsive phase of a powerful flare on 2017 September 6, which were simultaneously measured by the Hard X-ray Modulation Telescope (Insight-HXMT), as well as the ground-based BLENSW. The multiple periods, detected by applying a wavelet transform and Lomb-Scargle periodogram to the detrended light curves, are found to be ~20-55 s in the Ly`and mid-ultraviolet Balmer continuum emissions during the flare impulsive phase. Similar QPPs with multiple periods are also found in the hard X-ray emission and low-frequency radio emission. Our observations suggest that the flare QPPs could be related to nonthermal electrons accelerated by the repeated energy release process, i.e., triggering of repetitive magnetic reconnection, while the multiple periods might be modulated by the sausage oscillation of hot plasma loops. For the multiperiodic pulsations, other generation mechanisms could not be completely ruled out.

NOx Emission Flux Measurements with Multiple Mobile-DOAS Instruments in Beijing 期刊论文 OAI收割
REMOTE SENSING, 2020, 卷号: 12
作者: Huang, Yeyuan; Li, Ang; Xie, Pinhua; Hu, Zhaokun; Xu, Jin

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收藏 | 浏览/下载：54/0 | 提交时间：2020/10/27

NOX emission flux mobile-DOAS mega-city

Carbon and nutrients as indictors of daily fluctuations of pCO(2) and CO2 flux in a river draining a rapidly urbanizing area 期刊论文 OAI收割
ECOLOGICAL INDICATORS, 2020, 卷号: 109, 页码: 14
作者: Li, Siyue; Luo, Jiachen; Wu, Daishe; Xu, Y. Jun

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收藏 | 浏览/下载：24/0 | 提交时间：2020/08/24

River CO2 emission Carbon flux Carbon cycling Human activities Eutrophication Dissolved organic carbon

An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242 期刊论文 OAI收割
Astronomy and Astrophysics, 2020, 卷号: 641, 页码: A101
作者: HXMT

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收藏 | 浏览/下载：58/0 | 提交时间：2022/02/08

accretion accretion disks black hole physics X-rays: binaries time Astrophysics - High Energy Astrophysical Phenomena Abstract:
Aims: Flip-flops are top-hat-like X-ray flux variations, which have been observed in some transient accreting black hole binary systems, and feature simultaneous changes in the spectral hardness and the power density spectrum (PDS). They occur at a crucial time in the evolution of these systems, when the accretion disc emission starts to dominate over coronal emission. Flip-flops remain a poorly understood phenomenon, so we aim to thoroughly investigate them in a system featuring several such transitions.
Methods: Within the multitude of observations of Swift J1658.2-4242 during its outburst in early 2018, we detected 15 flip-flops, enabling a detailed analysis of their individual properties and the differences between them. We present observations by XMM-Newton, NuSTAR, Astrosat, Swift, Insight-HXMT, INTEGRAL, and ATCA. We analysed their light curves, searched for periodicities, computed their PDSs, and fitted their X-ray spectra, to investigate the source behaviour during flip-flop transitions and how the interval featuring flip-flops differs from the rest of the outburst.
Results: The flip-flops of Swift J1658.2-4242 are of an extreme variety, exhibiting flux differences of up to 77% within 100 s, which is much larger than what has been seen previously. We observed radical changes in the PDS simultaneous with the sharp flux variations, featuring transitions between the quasi-periodic oscillation types C and A, which have never been observed before. Changes in the PDS are delayed, but more rapid than changes in the light curve. Flip-flops occur in two intervals within the outburst, separated by about two weeks in which these phenomena were not seen. Transitions between the two flip-flop states occurred at random integer multiples of a fundamental period of 2.761 ks in the first interval and 2.61 ks in the second. Spectral analysis reveals the high and low flux flip-flop states to be very similar, but distinct from intervals lacking flip-flops. A change of the inner temperature of the accretion disc is responsible for most of the flux difference in the flip-flops. We also highlight the importance of correcting for the influence of the dust scattering halo on the X-ray spectra.