Transport effects on the vertical distribution of tropospheric ozone over the tropical marine regions surrounding India

Lal, Shyam; Venkataramani, S.; Srivastava, Shuchita; Gupta, S. K.; Mallik, Chinmay; Naja, Manish; Sarangi, T.; Acharya, Y. B.; Liu, Xueliang

doi:10.1002/jgrd.50180

Cited by 38 publications

(29 citation statements)

References 38 publications

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“…It is established in the previous studies that LRT plays an important role in the AS pre-monsoon ozone pool (Lal and Lawrence, 2001;Chand et al, 2003;Srivastava et al, 2011Srivastava et al, , 2012Lal et al, 2013Lal et al, , 2014. Trajectory models are used to investigate the LRT pathways of the air parcels.…”

Section: Long-range Transport Mechanism and Pollutant Accumulationmentioning

confidence: 99%

“…In previous studies using the ozonesonde measurements above the west coast of India and the data from two campaigns 1999 INDian Ocean EXperiment (INDOEX) campaigns and the Integrated Campaign for Aerosols, Gases and Radiation Budget (ICARB) campaign, which was conducted during March-May 2006), the higher AS TOC during pre-monsoon season was confirmed to be significantly influenced by LRT of the continental anthropogenically influenced outflows from the Middle East, western India, Africa, North America and Europe (Lal and Lawrence, 2001;Chand et al, 2003;Srivastava et al, 2011Srivastava et al, , 2012Lal et al, 2013Lal et al, , 2014. In addition, by comparing the INDOEX ozone measurements from both sides (northern and southern) of the ITCZ (Intertropical Convergence Zone), the influence of the ITCZ functioning as a sink for ozone was determined by the observed 4 times higher TOC values on the northern side of AS compared to the southern side (Chand et al, 2003).…”

Section: Introductionmentioning

confidence: 97%

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Tropospheric ozone maxima observed over the Arabian Sea during the pre-monsoon

Jia¹,

Ladstätter-Weißenmayer²,

Hou

et al. 2017

Atmos. Chem. Phys.

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Abstract. An enhancement of the tropospheric ozone column (TOC) over Arabian Sea (AS) during the pre-monsoon season is reported in this study. The potential sources of the AS spring ozone pool are investigated by use of multiple data sets (e.g., SCIAMACHY Limb-Nadir-Matching TOC, OMI/MLS TOC, TES TOC, MACC reanalysis data, MOZART-4 model and HYSPLIT model). Three-quarters of the enhanced ozone concentrations are attributed to the 0-8 km height range. The main source of the ozone enhancement is considered to be caused by long-range transport of ozone pollutants from India ( ∼ 50 % contributions to the lowest 4 km, ∼ 20 % contributions to the 4-8 km height range), the Middle East, Africa and Europe (∼ 30 % in total). In addition, the vertical pollution accumulation in the lower troposphere, especially at 4-8 km, was found to be important for the AS spring ozone pool formation. Local photochemistry, on the other hand, plays a negligible role in producing ozone at the 4-8 km height range. In the 0-4 km height range, ozone is quickly removed by wet deposition. The AS spring TOC maxima are influenced by the dynamical variations caused by the sea surface temperature (SST) anomaly during the El Niño period in 2005 and 2010 with a ∼ 5 DU decrease.

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Section: Long-range Transport Mechanism and Pollutant Accumulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Tropospheric ozone maxima observed over the Arabian Sea during the pre-monsoon

Jia¹,

Ladstätter-Weißenmayer²,

Hou

et al. 2017

Atmos. Chem. Phys.

View full text Add to dashboard Cite

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“…Although validation of the ozone profile product (mostly earlier versions) has been partially performed against aircraft, ozonesonde, and microwave limb sounder (MLS) data, these evaluations are limited to certain time periods and/or spatial region and/or to only portion of the product (e.g., OC or TOC only) (Bak et al, 2013a;Hayashida et al, 2015;Lal et al, 2013;Liu et al, 2010a, b;Pittman et al, 2009;Sellitto et al, 2011;Wang et al, 2011;Yang et al, 2007;Ziemke et al, 2014). Additionally, the quality of ozone profile retrievals is very sensitive to the signal-to-noise ratio (SNR) of the radiance measurements as well as their radiometric calibration, which may degrade over time as shown in GOME and GOME-2 retrievals (Cai et al, 2012;Liu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Validation of 10-year SAO OMI Ozone Profile (PROFOZ) product using ozonesonde observations

et al. 2017

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Abstract. We validate the Ozone Monitoring Instrument (OMI) Ozone Profile (PROFOZ) product from October 2004 through December 2014 retrieved by the Smithsonian Astrophysical Observatory (SAO) algorithm against ozonesonde observations. We also evaluate the effects of OMI row anomaly (RA) on the retrieval by dividing the dataset into before and after the occurrence of serious OMI RA, i.e., pre-RA (2004) and post-RA (2009-2014. The retrieval shows good agreement with ozonesondes in the tropics and midlatitudes and for pressure <∼ 50 hPa in the high latitudes. It demonstrates clear improvement over the a priori down to the lower troposphere in the tropics and down to an average of ∼ 550 (300) hPa at middle (high) latitudes. In the tropics and midlatitudes, the profile mean biases (MBs) are less than 6 %, and the standard deviations (SDs) range from 5 to 10 % for pressure <∼ 50 hPa to less than 18 % (27 %) in the tropics (midlatitudes) for pressure >∼ 50 hPa after applying OMI averaging kernels to ozonesonde data. The MBs of the stratospheric ozone column (SOC, the ozone column from the tropopause pressure to the ozonesonde burst pressure) are within 2 % with SDs of < 5 % and the MBs of the tropospheric ozone column (TOC) are within 6 % with SDs of 15 %. In the high latitudes, the profile MBs are within 10 % with SDs of 5-15 % for pressure <∼ 50 hPa but increase to 30 % with SDs as great as 40 % for pressure >∼ 50 hPa. The SOC MBs increase up to 3 % with SDs as great as 6 % and the TOC SDs increase up to 30 %. The comparison generally degrades at larger solar zenith angles (SZA) due to weaker signals and additional sources of error, leading to worse performance at high latitudes and during the midlatitude winter. Agreement also degrades with increasing cloudiness for pressure >∼ 100 hPa and varies with cross-track position, especially with large MBs and SDs at extreme off-nadir positions. In the tropics and midlatitudes, the post-RA comparison is considerably worse with larger SDs reaching 2 % in the stratosphere and 8 % in the troposphere and up to 6 % in TOC. There are systematic differences that vary with latitude compared to the pre-RA comparison. The retrieval comparison demonstrates good long-term stability during the pre-RA period but exhibits a statistically significant trend of 0.14-0.7 % year −1 for pressure <∼ 80 hPa, 0.7 DU year −1 in SOC, and −0.33 DU year −1 in TOC during the post-RA period. The spatiotemporal variation of retrieval performance suggests the need to improve OMI's radiometric calibration especially during the post-RA period to maintain the long-term stability and reduce the latitude/season/SZA and cross-track dependency of retrieval quality.

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“…Most of the studies based on in situ measurements have, however, been confined to the southern part of India (e.g. Mandal et al, 1998;Sinha et al, 2016) and the adjacent marine regions (Lal et al, 2013). Ganguly and Tzanis (2011) used ozone-sonde observations from three Indian stations operated by the Indian Meteorological Department (IMD) and suggested that overall STT only plays a minor role in the budget of tropospheric ozone over India.…”

Section: Introductionmentioning

confidence: 99%

Secondary ozone peaks in the troposphere over the Himalayas

et al. 2017

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Abstract. Layers with strongly enhanced ozone concentrations in the middle-upper troposphere, referred to as secondary ozone peaks (SOPs), have been observed in different regions of the world. Here we use the global ECHAM5/MESSy atmospheric chemistry model (EMAC) to (i) investigate the processes causing SOPs, (ii) explore both their frequency of occurrence and seasonality, and (iii) assess their effects on the tropospheric ozone budget over the Himalayas. The vertical profiles of potential vorticity (PV) and a stratospheric ozone tracer (O 3 s) in EMAC simulations, in conjunction with the structure of SOPs, suggest that SOPs over the Himalayas are formed by stratosphereto-troposphere transport (STT) of ozone. The spatial distribution of O 3 s further shows that such effects are in general most pronounced in the northern part of India. Model simulated ozone distributions and backward air trajectories show that ozone rich air masses, associated with STT, originate as far as northern Africa and the North Atlantic Ocean, the Middle East, as well as in nearby regions in Afghanistan and Pakistan, and are rapidly (within 2-3 days) transported to the Himalayas. Analysis of a 15-year (2000-2014) EMAC simulation shows that the frequency of SOPs is highest during the pre-monsoon season (e.g. 11 % of the time in May), while no intense SOP events are found during the July-October period. The SOPs are estimated to enhance the tropospheric column ozone (TCO) over the central Himalayas by up to 21 %.

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Transport effects on the vertical distribution of tropospheric ozone over the tropical marine regions surrounding India

Cited by 38 publications

References 38 publications

Tropospheric ozone maxima observed over the Arabian Sea during the pre-monsoon

Tropospheric ozone maxima observed over the Arabian Sea during the pre-monsoon

Validation of 10-year SAO OMI Ozone Profile (PROFOZ) product using ozonesonde observations

Secondary ozone peaks in the troposphere over the Himalayas

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