The O2/N2 Ratio and CO2 Airborne Southern Ocean (ORCAS) Study

O2/N2 比率和 CO2 机载南大洋 (ORCAS) 研究

• 批准号: 1424387
• 负责人: Britton Stephens
• 金额: $ 1.84万
• 依托单位: University Corporation For Atmospheric Res
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1424387&HistoricalAwards=false
• 关键词: O2; N2; Ratio; CO2; Airborne

The Southern Ocean currently absorbs a significant amount of the atmospheric burden of human produced CO2 emitted into the atmosphere, but the future trajectory of this sink is highly uncertain. Sparse observations and complex interacting physical and biological processes limit our understanding of biogeochemistry and climate feedbacks at high southern latitudes. The O2/N2 Ratio and CO2 Airborne Southern Ocean (ORCAS) Study will advance our understanding of the physical and biological controls on tropospheric air-sea exchange of O2 and CO2 over the Southern Ocean. This will be achieved through intensive airborne surveys of atmospheric O2, CO2, related gases, along with ocean surface properties over selected biogeochemical sites over the South Pacific and the Antarctic Peninsula. ORCAS will utilize the NSF/NCAR Gulfstream V (GV) aircraft with a suite of high precision in situ and remote sensing instruments, and whole-air samplers on 14 flights over an interval of 6 weeks in austral mid-summer. The primary objectives are to observe the large scale tropospheric distributions of O2 and CO2, to characterize regional scale relationships between vertical O2 and CO2 gradients, and to estimate local scale O2 fluxes via Lagrangian boundary layer budgeting with coincident bio-optical remote sensing of the ocean surface.

目前，南大洋吸收了大气中产生的大气人的大气负担，但该水槽的未来轨迹高度不确定。稀疏的观测和复杂的相互作用的物理和生物学过程限制了我们对高南部纬度的生物地球化学和气候反馈的理解。 O2/N2的比率和CO2空降南大洋（ORCAS）研究将使我们对南大洋上O2和CO2的对流层空气海洋交换的物理和生物控制的理解。这将通过对大气O2，CO2，相关气体以及在南太平洋和南极半岛上选定的生物地球化学地点的海面特性以及海面特性以及海面特性以及海面特性进行密集的空气传播调查来实现。 Orcas将使用NSF/NCAR Gulfstream V（GV）飞机使用高精度的原位和遥感仪器，在澳大利亚仲夏的6周间隔6周的时间内，在14个航班上使用全空中采样器。主要目标是观察O2和CO2的大规模对流层分布，以表征垂直O2和CO2梯度之间的区域尺度关系，并通过Lagrangian边界层预算估算局部规模的O2通量，并具有一致的海洋表面生物光遥控感。