Boreal tree pollen sensed by polarization lidar: Depolarizing biogenic chaff

Details Boreal tree pollen sensed by polarization lidar: Depolarizing biogenic chaff Boreal tree pollen sensed by polarization lidar: Depolarizing biogenic chaff

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3518810s&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 18, CiteID L18810

Other

Atmospheric Processes: Remote Sensing, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Processes: Instruments And Techniques

Scientific paper

Polarization (0.694 μm) lidar measurements show that tree pollen can generate strong laser depolarization in the backscatter from the lower atmosphere. Examples are given illustrating that linear depolarization ratios up to 0.3 are measured in plumes of paper birch pollen at the onset of boreal forest green-out. These pollen are ~25 μm in diameter and near-spherical in shape, but with lobes protruding from a surface membrane, which appears to produce the depolarization. Similar lidar findings are frequently observed during the summer at Fairbanks, Alaska, indicating that various types of seasonal pollen releases may be identified by polarization lidar. This scattering behavior is likely a general attribute of pollen and other suspended biogenic debris, which has implications for benefiting human health. This source of laser depolarization should not be confused with the presence of airborne dust or certain pollution particles, but is a natural background aerosol component caused by plant reproduction, as should be recognized in current global polarization lidar aerosol research using the CALIPSO satellite.

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