Carbon Fluxes across Boundaries in the Pacific Sector of the Arctic Ocean in a Changing Environment

摘要: In this chapter we examine carbon fluxes across the land-ocean and air-sea boundaries in Pacific Arctic Region (PAR) as well ocean gateway exchanges region. The latter includes dissolved inorganic (DIC) transported into area from Ocean via Bering Strait exported to Atlantic Canadian Archipelago, between various sub-regions within system. We emphasize changes magnitudes of these context climate warming sea-ice melt, other hydrological cycle Arctic. conclude that while inflow DIC is relatively quantified (623 ± 78 Tg C yr-1; T=1012), intermittent input flux East Siberian Sea (ESS) not (32 16 yr-1). Most uncertainty associated with variability actual water rather than content water, thus viewed a systematic error our mass balance analysis. Furthermore, determined an export 749 yr-1 Ocean, caveat term has unknown due paucity data Archipelago. Within PAR, Chukchi dominant site for atmospheric dioxide (CO2) uptake (up 35-46 yr-1), Beaufort (2.9 yr-1) Archipelago (~10 take-up much less CO2 potentially weak source atmosphere during certain times year. Additionally, ESS shelf net (< 5 Summertime capacity deep Canada Basin increased greatly over past few years retreat progresses rapidly though earlier estimates may be on high end. Overall, PAR appears more it receives through combined inputs ESS, atmosphere, rivers by small amount (45 or 6%). Our preliminary budget suggests probably weakly heterotrophic (i.e., respiring organic carbon, OC, its production). This tentative assessment trophic status if supported further data, addition labile OC produced highly productive marginal seas, some riverine coastal erosion-derived also recycled As progresses, produce Ocean. Whether change will turn weaker sink even uncertain dependent multiple factors control rate surface increase versus increase.