Skip to main content
eScholarship
Open Access Publications from the University of California

UC Irvine

UC Irvine Previously Published Works bannerUC Irvine

Atmospheric variability of biogenic VOCs in the surface layer measured by proton-transfer-reaction mass spectrometry

  • Author(s): Karl, T
  • Guenther, A
  • et al.
Abstract

Fast response measurements of biogenic volatile organic compounds (VOC) using proton-transfer-reaction mass spectrometry (PTR-MS) were conducted above a deciduous temperate, a tropical rain and an evergreen needle forest. We explore how the variance of a compound relates to the surface flux and lifetime (τ) at these sites. Our results suggest that a modified variance method can be used for estimating surface fluxes of isoprene and methanol above sites characterized by homogenous surface emissions. The normalized variability σ C/C, generally used for variability-lifetime relationships, increases as a function of averaging period, and follows an inverse lifetime-dependence. The variability of short-lived compound lies within the predicted range for mixed layer parameterizations such as the top-down (TD)-bottom-up (BU) variance functions. For lifetimes >1 day, significant deviation due to mesoscale processes adds to the variability on timescales above ∼30 min. © 2004 Elsevier B.V. All rights reserved.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View