It is specifically designed for high-altitude missions over land and sea, and can fire its weapon from up to 5,000 meters. The CH-4 also “has a retractable electro-optical sensor turret, and...

2015年9月1日 · Here we report atmospheric CH 4 levels together with δ 13 C-CH 4 from offshore China (31°N) to the central Arctic Ocean (up to 87°N) from July to September 2012. CH 4 concentrations and...

ch-4：1998年标准，适用高速四冲程柴油引擎并符合美国1998年废气排放标准及使用含硫量低于0.5%的燃油，可替代cf-4级。 CI-4：2002年标准，适用符合美国2004年废气排放标准的高速四冲程柴油机。

2016年2月1日 · We measured dissolved methane (CH 4) at different depths and calculated sea-to-air CH 4 fluxes at 65 stations in the East China Sea (ECS) from August 4 to 31 of 2013. CH 4 concentrations in surface waters ranged from 2.07 to 27.39 nM and concentrations in bottom waters ranged from 1.76 to 31.35 nM.

2019年10月8日 · Oceanic emissions represent a highly uncertain term in the natural atmospheric methane (CH 4) budget, due to the sparse sampling of dissolved CH 4 in the marine environment. Here we overcome...

2025年2月1日 · This study elucidated the spatiotemporal patterns of CH 4 concentrations in sediment cores from the Bohai Sea and South Yellow Sea, revealing the complex interplay among geochemical factors, methanogen communities, and CH 4 levels. These findings suggest that methane release from sediments is a notable contributor to seawater methane ...

2018年3月6日 · We present a dataset of dissolved methane (CH 4) in the East China Sea (ECS) during five cruises in March, May, August, October and December 2011. CH 4 distribution in this region showed pronounced spatial and seasonal variability due to the complex mixing of different water masses and other variables.

2023年1月3日 · Accounting for CH 4 alongside CO 2 sea-air fluxes and identifying the mechanisms controlling these emissions is crucial to constrain the potential of coastal ecosystems as net atmospheric...

2021年4月4日 · CH 4 concentration ranges from 0.68 (29% saturation) to 10.90 nmol L −1 (436% saturation) (mean ± SD = 3.00 ± 8.59 nmol L −1); with maximum values at the upper limit (oxycline) of the OMZ, as observed at the coastal station (St. 3), and minimum values in the surface waters of the oligotrophic region (St. 18) (Table 1; Figure 4h).

2006年12月1日 · For the first time, CH4 concentrations in the water column were measured during three cruises in the northern South China Sea. The abnormally high subsurface CH4 concentrations that were found on...