Elevated Levels of Biogenic Nonmethane Hydrocarbons in the Marine Boundary Layer of the Arabian Sea During the Intermonsoon

2020 ◽  
Vol 125 (22) ◽  
Author(s):  
Nidhi Tripathi ◽  
L. K. Sahu ◽  
Arvind Singh ◽  
Ravi Yadav ◽  
Anil Patel ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Arabian Sea ◽  
Marine Boundary Layer ◽  
Nonmethane Hydrocarbons

High Levels of Isoprene in the Marine Boundary Layer of the Arabian Sea during Spring Inter-Monsoon: Role of Phytoplankton Blooms

2020 ◽  
Vol 4 (4) ◽  
pp. 583-590 ◽  
Author(s):  
Nidhi Tripathi ◽  
L. K. Sahu ◽  
Arvind Singh ◽  
Ravi Yadav ◽  
Kusum Komal Karati
Keyword(s):  
Boundary Layer ◽  
Arabian Sea ◽  
Marine Boundary Layer ◽  
Phytoplankton Blooms

Distribution of ozone in the marine boundary layer of Arabian Sea prior to monsoon: Prevailing airmass and effect of aerosols

2013 ◽  
Vol 74 ◽  
pp. 18-28 ◽  
Author(s):  
Prabha R. Nair ◽  
Liji Mary David ◽  
S. Aryasree ◽  
K. Susan George
Keyword(s):  
Boundary Layer ◽  
Arabian Sea ◽  
Marine Boundary Layer

scholarly journals Net ozone production and its relationship to NO<sub>x</sub> and VOCs in the marine boundary layer around the Arabian Peninsula

2019 ◽  
Author(s):  
Ivan Tadic ◽  
John N. Crowley ◽  
Dirk Dienhart ◽  
Philipp Eger ◽  
Hartwig Harder ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Red Sea ◽  
General Circulation ◽  
Arabian Sea ◽  
Marine Boundary Layer ◽  
Arabian Peninsula ◽  
Water Vapor Pressure ◽  
Ozone Production ◽  
The Mediterranean ◽  
Northern Red Sea

Abstract. Strongly enhanced tropospheric ozone mixing ratios have been reported in the Arabian Basin, a region with intense solar radiation and high concentrations of ozone precursors such as nitrogen oxides and volatile organic compounds. To analyze photochemical ozone production in the marine boundary layer (MBL) around the Arabian Peninsula, we use ship-borne observations of NO, NO2, O3, OH, HO2, HCHO, actinic flux, water vapor, pressure and temperature obtained during the summer 2017 Air Quality and Climate in the Arabian Basin (AQABA) campaign, compare them to simulation results of the ECHAM-MESSy atmospheric chemistry (EMAC) general circulation model. Net ozone production rates (NOPR) were greatest over the Gulf of Oman, the Northern Red Sea and the Arabian Gulf with median values of 14 ppbv day−1, 16 ppbv day−1 and 28 ppbv day−1, respectively. NOPR over the Mediterranean, the Southern Red Sea and the Arabian Sea did not significantly deviate from zero; however, results for the Arabian Sea indicate weak net ozone production of 5 ppbv day−1, and net ozone destruction over the Mediterranean and the Southern Red Sea with −2 ppbv day−1 and −4 ppbv day−1, respectively. Constrained by measured HCHO/NO2-ratios, our photochemistry calculations show that net ozone production in the MBL around the Arabian Peninsula occurs mostly in a transition regime between NOx and VOC-limitation with a tendency towards NOx-limitation except over the Northern Red Sea and the Oman Gulf.

scholarly journals Net ozone production and its relationship to nitrogen oxides and volatile organic compounds in the marine boundary layer around the Arabian Peninsula

2020 ◽  
Vol 20 (11) ◽  
pp. 6769-6787 ◽  
Author(s):  
Ivan Tadic ◽  
John N. Crowley ◽  
Dirk Dienhart ◽  
Philipp Eger ◽  
Hartwig Harder ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Red Sea ◽  
Arabian Sea ◽  
Marine Boundary Layer ◽  
Arabian Peninsula ◽  
Volatile Organic ◽  
The Mediterranean ◽  
Northern Red Sea

Abstract. Strongly enhanced tropospheric ozone (O3) mixing ratios have been reported in the Arabian Basin, a region with intense solar radiation and high concentrations of O3 precursors such as nitrogen oxides (NOx) and volatile organic compounds (VOCs). To analyze photochemical O3 production in the marine boundary layer (MBL) around the Arabian Peninsula, we use shipborne observations of NO, NO2, O3, OH, HO2, HCHO, the actinic flux, water vapor, pressure and temperature obtained during the summer 2017 Air Quality and Climate in the Arabian Basin (AQABA) campaign, and we compare them to simulation results from the ECHAM-MESSy Atmospheric Chemistry (EMAC) general circulation model. Net O3 production rates (NOPRs) were greatest over both the Gulf of Oman and the northern Red Sea (16 ppbv d−1) and over the Arabian Gulf (32 ppbv d−1). The NOPR over the Mediterranean, the southern Red Sea and the Arabian Sea did not significantly deviate from zero; however, the results for the Arabian Sea indicated weak net O3 production of 5 ppbv d−1 as well as net O3 destruction over the Mediterranean and the southern Red Sea with values of −1 and −4 ppbv d−1, respectively. Constrained by HCHO∕NO2 ratios, our photochemistry calculations show that net O3 production in the MBL around the Arabian Peninsula mostly occurs in NOx-limited regimes with a significant share of O3 production occurring in the transition regime between NOx limitation and VOC limitation over the Mediterranean and more significantly over the northern Red Sea and Oman Gulf.

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