TY - JOUR

T1 - The role of a suburban forest in controlling vertical trace gas and OH reactivity distributions - a case study for the Seoul metropolitan area

AU - Kim, Saewung

AU - Seco, Roger

AU - Gu, Dasa

AU - Sanchez, Dianne

AU - Jeong, Daun

AU - Guenther, Alex B.

AU - Lee, Youngro

AU - Mak, John E.

AU - Su, Luping

AU - Kim, Dan Bi

AU - Lee, Youngjae

AU - Ahn, Joon-Young

AU - Mcgee, Tom

AU - Sullivan, John

AU - Long, Russell

AU - Brune, William H.

AU - Thames, Alexander

AU - Wisthaler, Armin

AU - Müller, Markus

AU - Mikoviny, Thomas

AU - Weinheimer, Andy

AU - Yang, Melissa

AU - Woo, Jung-Hun

AU - Kim, Soyoung

AU - Park, Hyunjoo

PY - 2021

Y1 - 2021

N2 - We present trace gas vertical profiles observed by instruments on the NASA DC-8 and at a ground site during the Korea-US air quality study (KORUS) field campaign in May to June 2016. We focus on the region near the Seoul metropolitan area and its surroundings where both anthropogenic and natural emission sources play an important role in local photochemistry. Integrating ground and airborne observations is the major research goal of many atmospheric chemistry field campaigns. Although airborne platforms typically aim to sample from near surface to the free troposphere, it is difficult to fly very close to the surface especially in environments with complex terrain or a populated area. A detailed analysis integrating ground and airborne observations associated with specific concentration footprints indicates that reactive trace gases are quickly oxidized below an altitude of 700 m. The total OH reactivity profile has a rapid decay in the lower part of troposphere from surface to the lowest altitude (700 m) sampled by the NASA DC-8. The decay rate is close to that of very reactive biogenic volatile organic compounds such as monoterpenes. Therefore, we argue that photochemical processes in the bottom of the boundary layer, below the typical altitude of aircraft sampling, should be thoroughly investigated to properly assess ozone and secondary aerosol formation. This journal is

AB - We present trace gas vertical profiles observed by instruments on the NASA DC-8 and at a ground site during the Korea-US air quality study (KORUS) field campaign in May to June 2016. We focus on the region near the Seoul metropolitan area and its surroundings where both anthropogenic and natural emission sources play an important role in local photochemistry. Integrating ground and airborne observations is the major research goal of many atmospheric chemistry field campaigns. Although airborne platforms typically aim to sample from near surface to the free troposphere, it is difficult to fly very close to the surface especially in environments with complex terrain or a populated area. A detailed analysis integrating ground and airborne observations associated with specific concentration footprints indicates that reactive trace gases are quickly oxidized below an altitude of 700 m. The total OH reactivity profile has a rapid decay in the lower part of troposphere from surface to the lowest altitude (700 m) sampled by the NASA DC-8. The decay rate is close to that of very reactive biogenic volatile organic compounds such as monoterpenes. Therefore, we argue that photochemical processes in the bottom of the boundary layer, below the typical altitude of aircraft sampling, should be thoroughly investigated to properly assess ozone and secondary aerosol formation. This journal is

U2 - 10.1039/d0fd00081g

DO - 10.1039/d0fd00081g

M3 - Journal article

C2 - 33346290

AN - SCOPUS:85103249449

VL - 226

SP - 537

EP - 550

JO - Faraday Discussions

JF - Faraday Discussions

SN - 1359-6640

ER -