scholarly journals One-dimensional photochemical study of H2O2, CH3OOH, and HCHO in the marine boundary layer during Pacific Exploratory Mission in the Tropics (PEM-Tropics) B

2004 ◽  
Vol 109 (D6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Wonil Chang ◽  
Meehye Lee ◽  
Brian G. Heikes
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
One Dimensional ◽  
Exploratory Mission ◽  
The Tropics

scholarly journals Iodine monoxide in the Western Pacific marine boundary layer

2013 ◽  
Vol 13 (6) ◽  
pp. 3363-3378 ◽  
Author(s):  
K. Großmann ◽  
U. Frieß ◽  
E. Peters ◽  
F. Wittrock ◽  
J. Lampel ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Western Pacific ◽  
Optical Absorption Spectroscopy ◽  
Mixing Ratios ◽  
Iodine Monoxide ◽  
German Research ◽  
Inorganic Iodine ◽  
The Tropics ◽  
The Western Pacific

Abstract. A latitudinal cross-section and vertical profiles of iodine monoxide (IO) are reported from the marine boundary layer of the Western Pacific. The measurements were taken using Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) during the TransBrom cruise of the German research vessel Sonne, which led from Tomakomai, Japan (42° N, 141° E) through the Western Pacific to Townsville, Australia (19° S, 146° E) in October 2009. In the marine boundary layer within the tropics (between 20° N and 5° S), IO mixing ratios ranged between 1 and 2.2 ppt, whereas in the subtropics and at mid-latitudes typical IO mixing ratios were around 1 ppt in the daytime. The profile retrieval reveals that the bulk of the IO was located in the lower part of the marine boundary layer. Photochemical simulations indicate that the organic iodine precursors observed during the cruise (CH3I, CH2I2, CH2ClI, CH2BrI) are not sufficient to explain the measured IO mixing ratios. Reasonable agreement between measured and modelled IO can only be achieved if an additional sea-air flux of inorganic iodine (e.g., I2) is assumed in the model. Our observations add further evidence to previous studies that reactive iodine is an important oxidant in the marine boundary layer.

scholarly journals Iodine monoxide in the Western Pacific marine boundary layer

2012 ◽  
Vol 12 (10) ◽  
pp. 27475-27519 ◽  
Author(s):  
K. Großmann ◽  
U. Frieß ◽  
E. Peters ◽  
F. Wittrock ◽  
J. Lampel ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Western Pacific ◽  
Optical Absorption Spectroscopy ◽  
Mixing Ratios ◽  
Iodine Monoxide ◽  
German Research ◽  
Inorganic Iodine ◽  
The Tropics ◽  
The Western Pacific

Abstract. A latitudinal cross-section and vertical profiles of iodine monoxide (IO) are reported from the marine boundary layer of the Western Pacific. The measurements were taken using Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) during the TransBrom cruise of the German research vessel Sonne, which led from Tomakomai, Japan (42° N, 141° E) through the Western Pacific to Townsville, Australia (19° S, 146° E) in October 2009. In the marine boundary layer within the tropics (between 20° N and 5° S), IO mixing ratios ranged between 1 and 2.2 ppt, whereas in the subtropics and at mid-latitudes typical IO mixing ratios were around 1 ppt in the daytime. The profile retrieval reveals that the bulk of the IO was located in the lower part of the marine boundary layer. Photochemical simulations indicate that the organic iodine precursors observed during the cruise (CH3I, CH2I2, CH2ClI, CH2BrI) are not sufficient to explain the measured IO mixing ratios. Reasonable agreement between measured and modelled IO can only be achieved, if an additional sea-air flux of inorganic iodine (e.g. I2) is assumed in the model. Our observations add further evidence to previous studies that reactive iodine is an important oxidant in the marine boundary layer.

A one-dimensional sectional model to simulate multicomponent aerosol dynamics in the marine boundary layer: 2. Model application

1998 ◽  
Vol 103 (D13) ◽  
pp. 16103-16117 ◽  
Author(s):  
James W. Fitzgerald ◽  
James J. Marti ◽  
William A. Hoppel ◽  
Glendon M. Frick ◽  
Fred Gelbard
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Model Application ◽  
One Dimensional ◽  
Aerosol Dynamics ◽  
Layer 2 ◽  
Sectional Model

The Vertical Structure of Tropical Convection and Its Impact on the Budgets of Water Vapor and Ozone

2005 ◽  
Vol 62 (5) ◽  
pp. 1560-1573 ◽  
Author(s):  
Ian Folkins ◽  
Randall V. Martin
Keyword(s):  
Boundary Layer ◽  
Water Vapor ◽  
Relative Humidity ◽  
Mass Flux ◽  
Diagnostic Model ◽  
Dimensional Model ◽  
Flux Divergence ◽  
One Dimensional ◽  
Ozone Profile ◽  
The Tropics

Abstract Convective clouds in the Tropics that penetrate the boundary layer inversion preferentially detrain into a shallow outflow layer (2–5 km) or a deep outflow layer (10–17 km). The properties of these layers are diagnosed from a one-dimensional model of the Tropics constrained by observed mean temperature and water vapor profiles. The mass flux divergence of the shallow cumuli (2–5 km) is balanced by a mass flux convergence of evaporatively forced descent (downdrafts), while the mass flux divergence of deep cumulonimbus clouds (10–17 km) is balanced by a mass flux convergence of clear-sky radiative descent. The pseudoadiabatic temperature stratification of the midtroposphere (5–10 km) suppresses cloud outflow in this interval. The detrainment profile in the deep outflow layer is shifted downward by about 1.5 km from the profile one would anticipate based on undilute pseudoadiabatic ascent of air from the boundary layer. The main source of water vapor to most of the tropical troposphere is evaporative moistening. Below 12 km, evaporatively forced descent plays an important role in the vertical mass flux budget of the Tropics. This gives rise to a coupling between the water vapor and mass flux budgets, which, between 5 and 10 km, provides a constraint on the variation of relative humidity with height. Between 12 and 15 km, the observed relative humidity profile can be reproduced by assuming a simple first-order balance between detrainment moistening and subsidence drying. The mean ozone profile of the Tropics can be reproduced using a simple one-dimensional model constrained by the cloud mass flux divergence profile of the diagnostic model.

scholarly journals Observations of iodine oxide in the Indian Ocean marine boundary layer: A transect from the tropics to the high latitudes

2019 ◽  
Vol 1 ◽  
pp. 100016 ◽  
Author(s):  
Anoop S. Mahajan ◽  
Liselotte Tinel ◽  
Shrivardhan Hulswar ◽  
Carlos A. Cuevas ◽  
Shanshan Wang ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Indian Ocean ◽  
Marine Boundary Layer ◽  
High Latitudes ◽  
The Indian Ocean ◽  
The Tropics
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