NO2 Column Abundance Measurements and Trace Gas Chemistry Regulating Arctic Stratospheric Ozone Abundance

A9302348克努特 本研究的目的是调查平流层二氧化氮（NO2）对臭氧化学和丰度的作用。 研究人员将在北方半球的两个高纬度地点使用黄昏吸收光谱法测量NO2柱密度，波长范围为430-450 nm，其中NO2具有明显的吸收特征。 其中一个地点（挪威斯瓦尔巴特群岛，北纬78度）预计将比另一个地点（阿拉斯加费尔班克斯，北纬65度）更频繁地出现在极地涡旋内部。 这些测量将持续进行，为扰动和未扰动平流层条件下的NO2丰度提供基线。 这组测量将使这些研究人员能够研究两个地点之间NO2气候学的差异，并将NO2丰度与平流层臭氧含量，温度和环流联系起来。 辐射传输模型，包括球形几何形状和折射的影响，在云和气溶胶层的存在下，将被用来构建合成光谱，这将使他们能够研究检索的NO2丰度云和气溶胶的影响，以及检索NO2垂直剖面的可行性的敏感性。

A9302348 Knut The aim of this research is to investigate the role of stratospheric nitrogen dioxide (NO2) on the ozone chemistry and abundance. The researchers will measure NO2 column densities at two high-latitude sites in the northern hemisphere using twilight absorption spectroscopy in the wavelength range 430-450 nm where NO2 has appreciable absorption features. One of these sites (Svalbard, Norway, 78 degrees N) is expected to be inside the polar vortex more frequently than the other (Fairbanks, Alaska, 65 degrees N). The measurements will be conducted on a continuous basis providing a baseline for NO2 abundance under perturbed as well as unperturbed stratospheric conditions. This set of measurements will allow these researchers to study differences in NO2 climatology between the two sites and relate the NO2 abundance to stratospheric ozone content, temperature, and circulation. Radiative transfer modeling including the effects of spherical geometry and refraction in the presence of cloud and aerosol layers will be used to construct synthetic spectra that will allow them to study the sensitivity of the retrieved NO2 abundance to cloud and aerosol effects as well as the feasibility of retrieving NO2 vertical profiles.