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Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions 期刊论文  OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES, 2022, 卷号: 121, 页码: 98-111
作者:  Zhang, Peipei;  Jiao, Ruyuan;  Gong, Chen;  Wang, Fang;  Yan, Weijin
  |  收藏  |  浏览/下载：36/0  |  提交时间：2022/09/21
Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions 期刊论文  OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES, 2022, 卷号: 121, 页码: 98-111
作者:  Zhang, Peipei;  Jiao, Ruyuan;  Gong, Chen;  Wang, Fang;  Yan, Weijin
  |  收藏  |  浏览/下载：29/0  |  提交时间：2022/09/21
Biochar and nitrogen fertilizer co-application changed SOC content and fraction composition in Huang-Huai-Hai plain, China 期刊论文  OAI收割
CHEMOSPHERE, 2022, 卷号: 291, 页码: 11
作者:  Dong, Linlin;  Yang, Xiao;  Shi, Linlin;  Shen, Yuan;  Wang, Lingqing
  |  收藏  |  浏览/下载：37/0  |  提交时间：2022/09/21
Biochar and nitrogen fertilizer co-application changed SOC content and fraction composition in Huang-Huai-Hai plain, China 期刊论文  OAI收割
CHEMOSPHERE, 2022, 卷号: 291, 页码: 11
作者:  Dong, Linlin;  Yang, Xiao;  Shi, Linlin;  Shen, Yuan;  Wang, Lingqing
  |  收藏  |  浏览/下载：37/0  |  提交时间：2022/09/21
Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions 期刊论文  OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES, 2022, 卷号: 121, 页码: 1-14
作者:  Zhang, Peipei;  Jiao, Ruyuan;  Gong, Chen;  Wang, Fang;  Yan, Weijin
  |  收藏  |  浏览/下载：8/0  |  提交时间：2023/02/06
The effects of nitrogen addition on soil organic carbon decomposition and microbial C-degradation functional genes abundance in a Pinus tabulaeformis forest 期刊论文  OAI收割
FOREST ECOLOGY AND MANAGEMENT, 2021, 卷号: 489, 页码: 11
作者:  Jing, Hang;  Li, Jingjing;  Yan, Benshuai;  Wei, Furong;  Wang, Guoliang
  |  收藏  |  浏览/下载：109/0  |  提交时间：2021/06/10
Drought effects on soil carbon and nitrogen dynamics in global natural ecosystems 期刊论文  OAI收割
EARTH-SCIENCE REVIEWS, 2021, 卷号: 214, 页码: 15
作者:  Deng, Lei;  Peng, Changhui;  Kim, Dong-Gill;  Li, Jiwei;  Liu, Yulin
  |  收藏  |  浏览/下载：82/0  |  提交时间：2021/04/25
Response of soil respiration to nitrogen fertilization: Evidence from a 6-year field study of croplands 期刊论文  OAI收割
GEODERMA, 2021, 卷号: 384, 页码: 9
作者:  Yan, Weiming;  Zhong, Yangquanwei;  Liu, Jin;  Shangguan, Zhouping
  |  收藏  |  浏览/下载：33/0  |  提交时间：2021/03/15
我国城市大气化石源CO_2的~(14)C示踪研究进展 期刊论文  OAI收割
地球科学进展, 2020, 卷号: 35, 期号: 9, 页码: 881-889
作者:  周卫健;  吴书刚;  熊晓虎;  程鹏;  王鹏
  |  收藏  |  浏览/下载：28/0  |  提交时间：2021/01/13
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
  |  收藏  |  浏览/下载：61/0  |  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.