Physical, Chemical, and Optical Properties of Snow: Impacts on Ocean-Atmosphere-Sea Ice-Snowpack Interactions (OASIS) and Sensitivity to Climate Change

加州大学戴维斯分校（UCD）的研究人员将与其他科学家合作，参加2009年在AK州巴罗举行的海洋-大气-海洋冰雪（OASIS）实地考察活动。该项目有三个主要目标，以雪的光化学为中心：1)测量雪颗粒中/表面可溶性物质的光吸收量，包括过氧化氢（H2O2）、硝酸盐、亚硝酸盐和未知的（可能是有机的）发色团。2)测量雪的物理、化学和光学特性。3)综合这些结果表征有机发色团对雪中光吸收的贡献，确定影响雪中光通量和光吸收的物理化学因素，研究雪光化学对雪和边界层组成的影响，并建立雪光化学模型。UCD团队还将协调OASIS实地活动。这将是首次研究有机物种对雪颗粒内/上发色团的贡献，并可能导致我们对雪光化学及其对大气成分影响的理解取得重大进展。更广泛的影响包括：在实地活动期间通过实时网络摄像头进行外展；与美国和国际电视台协调报道巴罗的现场工作；本科生参与；为戴维斯附近一所乡村高中的学生提供教育推广；协调外地活动的数据存档；并在会议上主持OASIS 2009会议。

Researchers at the University of California, Davis (UCD) will collaborate with other scientists in the Ocean-Atmosphere-Sea Ice-Snowpack (OASIS) 2009 field campaign at Barrow, AK. This project has three main objectives, centered around the photochemistry of snow: 1) Measure the amount of light absorption by soluble species in/on snow grains, including hydrogen peroxide (H2O2), nitrate, nitrite, and unknown (presumably organic) chromophores. 2) Measure the physical, chemical, and optical properties of the snow. 3) Integrate these results to characterize the contributions of organic chromophores to light absorption in snow, determine the physical and chemical factors affecting light fluxes and light absorption in snow, examine the effects of snow photochemistry on snow and boundary layer composition, and model the snow photochemistry. The UCD team will also coordinate the OASIS field campaign. This would be among the first studies of the contributions of organic species to the pool of chromophores in/on snow grains, and could lead to significant advances in our understanding of snow photochemistry and its impacts on atmospheric composition.Broader impacts include: outreach via live web cams during the field campaign; coordination with U.S. and international TV stations to cover the Barrow field work; participation of undergraduate students; educational outreach to students at a rural high school near Davis; coordination of data archiving from the field campaign; and hosting OASIS 2009 sessions at conferences.