Investigation of simultaneous effects of aerosol properties and aerosol peak height on the air mass factors for space-borne NO 2 retrievals

Hyunkee Hong, Hanlim Lee, Jhoon Kim, Ukkyo Jeong, Jaeyong Ryu, Dae Sung Lee

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We investigate the simultaneous effects of aerosol peak height (APH), aerosol properties, measurement geometry, and other factors on the air mass factor for NO 2 retrieval at sites with high NO 2 concentration. A comparison of the effects of high and low surface reflectance reveals that NO2 air mass factor (AMF) values over a snowy surface (surface reflectance 0.8) are generally higher than those over a deciduous forest surface (surface reflectance 0.05). Under high aerosol optical depth (AOD) conditions, the aerosol shielding effect over a high-albedo surface is revealed to reduce the path-length of light at the surface, whereas high single scattering albedo (SSA) conditions (e.g., SSA = 0.95) lead to an increase in the aerosol albedo effect, which results in an increased AMF over areas with low surface reflectance. We also conducted an in-depth study of the APH effect on AMF. For an AOD of 0.1 and half width (HW) of 5 km, NO2 AMF decreases by 29% from 1.36 to 0.96 as APH changes from 0 to 2 km. In the case of high-AOD conditions (0.9) and HW of 5 km, the NO2 AMF decreases by 240% from 1.85 to 0.54 as APH changes from 0 to 2 km. The AMF variation due to error in the model input parameters (e.g., AOD, SSA, aerosol shape, and APH) is also examined. When APH is 0 km with an AOD of 0.4, SSA of 0.88, and surface reflectance of 0.05, a 30% error in AOD induces an AMF error of between 4.85% and -3.67%, an SSA error of 0.04 leads to NO 2 VCD errors of between 4.46% and -4.77%, and a 30% error in AOD induces an AMF error of between -9.53% and 8.35% with an APH of 3 km. In addition to AOD and SSA, APH is an important factor in calculating AMF, due to the 2 km error in APH under high-SZA conditions, which leads to an NO 2 VCD error of over 60%. Aerosol shape is also found to have a measureable effect on AMF under high-AOD and small relative azimuth angle (RAA) conditions. The diurnal effect of the NO 2 profile is also examined and discussed.

Original languageEnglish
Article number208
JournalRemote Sensing
Volume9
Issue number3
DOIs
Publication statusPublished - 2017 Mar 1

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aerosol property
air mass
aerosol
optical depth
albedo
surface reflectance
scattering
effect

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

@article{d055bf50263840f3bf743b2d7a08264c,
title = "Investigation of simultaneous effects of aerosol properties and aerosol peak height on the air mass factors for space-borne NO 2 retrievals",
abstract = "We investigate the simultaneous effects of aerosol peak height (APH), aerosol properties, measurement geometry, and other factors on the air mass factor for NO 2 retrieval at sites with high NO 2 concentration. A comparison of the effects of high and low surface reflectance reveals that NO2 air mass factor (AMF) values over a snowy surface (surface reflectance 0.8) are generally higher than those over a deciduous forest surface (surface reflectance 0.05). Under high aerosol optical depth (AOD) conditions, the aerosol shielding effect over a high-albedo surface is revealed to reduce the path-length of light at the surface, whereas high single scattering albedo (SSA) conditions (e.g., SSA = 0.95) lead to an increase in the aerosol albedo effect, which results in an increased AMF over areas with low surface reflectance. We also conducted an in-depth study of the APH effect on AMF. For an AOD of 0.1 and half width (HW) of 5 km, NO2 AMF decreases by 29{\%} from 1.36 to 0.96 as APH changes from 0 to 2 km. In the case of high-AOD conditions (0.9) and HW of 5 km, the NO2 AMF decreases by 240{\%} from 1.85 to 0.54 as APH changes from 0 to 2 km. The AMF variation due to error in the model input parameters (e.g., AOD, SSA, aerosol shape, and APH) is also examined. When APH is 0 km with an AOD of 0.4, SSA of 0.88, and surface reflectance of 0.05, a 30{\%} error in AOD induces an AMF error of between 4.85{\%} and -3.67{\%}, an SSA error of 0.04 leads to NO 2 VCD errors of between 4.46{\%} and -4.77{\%}, and a 30{\%} error in AOD induces an AMF error of between -9.53{\%} and 8.35{\%} with an APH of 3 km. In addition to AOD and SSA, APH is an important factor in calculating AMF, due to the 2 km error in APH under high-SZA conditions, which leads to an NO 2 VCD error of over 60{\%}. Aerosol shape is also found to have a measureable effect on AMF under high-AOD and small relative azimuth angle (RAA) conditions. The diurnal effect of the NO 2 profile is also examined and discussed.",
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Investigation of simultaneous effects of aerosol properties and aerosol peak height on the air mass factors for space-borne NO 2 retrievals . / Hong, Hyunkee; Lee, Hanlim; Kim, Jhoon; Jeong, Ukkyo; Ryu, Jaeyong; Lee, Dae Sung.

In: Remote Sensing, Vol. 9, No. 3, 208, 01.03.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Investigation of simultaneous effects of aerosol properties and aerosol peak height on the air mass factors for space-borne NO 2 retrievals

AU - Hong, Hyunkee

AU - Lee, Hanlim

AU - Kim, Jhoon

AU - Jeong, Ukkyo

AU - Ryu, Jaeyong

AU - Lee, Dae Sung

PY - 2017/3/1

Y1 - 2017/3/1

N2 - We investigate the simultaneous effects of aerosol peak height (APH), aerosol properties, measurement geometry, and other factors on the air mass factor for NO 2 retrieval at sites with high NO 2 concentration. A comparison of the effects of high and low surface reflectance reveals that NO2 air mass factor (AMF) values over a snowy surface (surface reflectance 0.8) are generally higher than those over a deciduous forest surface (surface reflectance 0.05). Under high aerosol optical depth (AOD) conditions, the aerosol shielding effect over a high-albedo surface is revealed to reduce the path-length of light at the surface, whereas high single scattering albedo (SSA) conditions (e.g., SSA = 0.95) lead to an increase in the aerosol albedo effect, which results in an increased AMF over areas with low surface reflectance. We also conducted an in-depth study of the APH effect on AMF. For an AOD of 0.1 and half width (HW) of 5 km, NO2 AMF decreases by 29% from 1.36 to 0.96 as APH changes from 0 to 2 km. In the case of high-AOD conditions (0.9) and HW of 5 km, the NO2 AMF decreases by 240% from 1.85 to 0.54 as APH changes from 0 to 2 km. The AMF variation due to error in the model input parameters (e.g., AOD, SSA, aerosol shape, and APH) is also examined. When APH is 0 km with an AOD of 0.4, SSA of 0.88, and surface reflectance of 0.05, a 30% error in AOD induces an AMF error of between 4.85% and -3.67%, an SSA error of 0.04 leads to NO 2 VCD errors of between 4.46% and -4.77%, and a 30% error in AOD induces an AMF error of between -9.53% and 8.35% with an APH of 3 km. In addition to AOD and SSA, APH is an important factor in calculating AMF, due to the 2 km error in APH under high-SZA conditions, which leads to an NO 2 VCD error of over 60%. Aerosol shape is also found to have a measureable effect on AMF under high-AOD and small relative azimuth angle (RAA) conditions. The diurnal effect of the NO 2 profile is also examined and discussed.

AB - We investigate the simultaneous effects of aerosol peak height (APH), aerosol properties, measurement geometry, and other factors on the air mass factor for NO 2 retrieval at sites with high NO 2 concentration. A comparison of the effects of high and low surface reflectance reveals that NO2 air mass factor (AMF) values over a snowy surface (surface reflectance 0.8) are generally higher than those over a deciduous forest surface (surface reflectance 0.05). Under high aerosol optical depth (AOD) conditions, the aerosol shielding effect over a high-albedo surface is revealed to reduce the path-length of light at the surface, whereas high single scattering albedo (SSA) conditions (e.g., SSA = 0.95) lead to an increase in the aerosol albedo effect, which results in an increased AMF over areas with low surface reflectance. We also conducted an in-depth study of the APH effect on AMF. For an AOD of 0.1 and half width (HW) of 5 km, NO2 AMF decreases by 29% from 1.36 to 0.96 as APH changes from 0 to 2 km. In the case of high-AOD conditions (0.9) and HW of 5 km, the NO2 AMF decreases by 240% from 1.85 to 0.54 as APH changes from 0 to 2 km. The AMF variation due to error in the model input parameters (e.g., AOD, SSA, aerosol shape, and APH) is also examined. When APH is 0 km with an AOD of 0.4, SSA of 0.88, and surface reflectance of 0.05, a 30% error in AOD induces an AMF error of between 4.85% and -3.67%, an SSA error of 0.04 leads to NO 2 VCD errors of between 4.46% and -4.77%, and a 30% error in AOD induces an AMF error of between -9.53% and 8.35% with an APH of 3 km. In addition to AOD and SSA, APH is an important factor in calculating AMF, due to the 2 km error in APH under high-SZA conditions, which leads to an NO 2 VCD error of over 60%. Aerosol shape is also found to have a measureable effect on AMF under high-AOD and small relative azimuth angle (RAA) conditions. The diurnal effect of the NO 2 profile is also examined and discussed.

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