Quantifying CO₂ Uptakes Over Oceans Using LIDAR: A Tentative Experiment in Bohai Bay

Abstract

Current observations show that the growth of the atmospheric CO 2 concentration is evidently lower than expected, suggesting that anthropogenic carbon emissions have been offset by some unclear carbon sinks. Oceans and terrestrial ecosystems are supposed to be responsible for the missing carbon sinks (Sabine et al., 2004;Takahashi et al., 2009). Scientists have utilized varieties of means to explore carbon fluxes of terrestrial ecosystems quantitatively in the recent decades, trying to narrow gaps between observations and estimates of models (Eldering et al., 2017;Watson et al., 2009). Comparing with progresses in estimating carbon fluxes of terrestrial ecosystems, we still have some barriers to a better understanding on carbon fluxes of oceans. We do know oceans offset anthropogenic carbon emissions but there are lacks of quantitative and accurate estimates of CO 2 fluxes over oceans. Therefore, we don't have insight knowledge on distributions and dynamics of ocean carbon uptakes. Some pieces of evidence suggest that there may be a trigger point beyond which CO 2 uptakes of oceans would rapidly decline or even shift to a net CO 2 emission (DeVries et al., 2019). Therefore, designing more measurement methods to estimate ocean CO 2 fluxes more reliably and efficiently is of great importance.The difference of CO 2 partial pressures in seawater (p(CO 2 ) sw ) and overlying air (p(CO 2 ) air ) would cause a net transfer of CO 2 flux between ocean and atmosphere (Wanninkhof, 2014). Experiments for measuring (p(CO 2 ) sw ) during ship tracks have been implemented in different regions of the global sea, which help to

Global Warming: Is It (Im)Possible to Stop It? The Systems Thinking Approach

“…It is well known that much of the heat from global warming is absorbed by the warming oceans; in fact, global warming is due to ocean warming. The phenomenon in (2), which affects uncovered land areas, has its counterpart in the spreading of "dark algae" in the Antarctic and in the oceans, whose temperatures rise due to global warming [92]. The masses of "dark algae", which do not reflect sunlight, further increase global warming, activating loop (R3), as shown in Figure 7.…”

Development of China’s first space-borne aerosol-cloud high-spectral-resolution lidar: retrieval algorithm and airborne demonstration

“…The configuration of A2P at 532 nm is shown in Table S2 [33]. The flight data in Qinhuangdao City, Hebei Province, China, on March 14, 2019 was processed in this study [33,34,50]. The A2P flight tracks last from 02:40 to 03:40 (UTC) and cover ocean, coastal city, town, forest, and mountains etc., which is marked in the red curved line in Fig.…”

“…The airborne ACHSRL prototype (A2P) was developed and an airborne campaign with the A2P was conducted over Qinhuangdao, China, in March 2019, for the evaluation of instrument performance and the validation of retrieval algorithms [32][33][34]. Up to date, the ACDL scientific team is working on the data processing yet for this airborne campaign.…”

Revealing the Spatiotemporal Patterns of Anthropogenic Light at Night within Ecological Conservation Redline Using Series Satellite Nighttime Imageries (2000–2020)

“…Ecosystems are vital for human survival and development since they provide tremendous ecological services, including biodiversity maintenance, water conservation, and climate change mitigation [1][2][3][4]. However, with the rapid development of the economy, the process of urbanization has led to enormous irreversible consequences to ecosystems, such as environmental pollution and a decrease in biodiversity [3,5,6].…”