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Book ; Online: Taehwa Research Forest

Sullivan, John T. / McGee, Thomas J. / Stauffer, Ryan M. / Thompson, Anne M. / Weinheimer, Andrew / Knote, Christoph / Janz, Scott / Wisthaler, Armin / Long, Russell / Szykman, James / Park, Jinsoo / Lee, Youngjae / Kim, Saewung / Jeong, Daun / Sanchez, Dianne / Twigg, Laurence / Sumnicht, Grant / Knepp, Travis / Schroeder, Jason R.

eISSN: 1680-7324

a receptor site for severe domestic pollution events in Korea during 2016

2019

Abstract: ... the remote Taehwa Research Forest (TRF) site and cause regulatory exceedances of ozone on 24 days. Two ...

Abstract	During the May–June 2016 International Cooperative Air Quality Field Study in Korea (KORUS-AQ), light synoptic meteorological forcing facilitated Seoul metropolitan pollution outflow to reach the remote Taehwa Research Forest (TRF) site and cause regulatory exceedances of ozone on 24 days. Two of these severe pollution events are thoroughly examined. The first, occurring on 17 May 2016, tracks transboundary pollution transport exiting eastern China and the Yellow Sea, traversing the Seoul Metropolitan Area (SMA), and then reaching TRF in the afternoon hours with severely polluted conditions. This case study indicates that although outflow from China and the Yellow Sea were elevated with respect to chemically unperturbed conditions, the regulatory exceedance at TRF was directly linked in time, space, and altitude to urban Seoul emissions. The second case studied, which occurred on 9 June 2016, reveals that increased levels of biogenic emissions, in combination with amplified urban emissions, were associated with severe levels of pollution and a regulatory exceedance at TRF. In summary, domestic emissions may be causing more pollution than by transboundary pathways, which have been historically believed to be the major source of air pollution in South Korea. The case studies are assessed with multiple aircraft, model (photochemical and meteorological) simulations, in situ chemical sampling, and extensive ground-based profiling at TRF. These observations clearly identify TRF and the surrounding rural communities as receptor sites for severe pollution events associated with Seoul outflow, which will result in long-term negative effects to both human health and agriculture in the affected areas.
Subject code	333
Language	English
Publishing date	2019-04-12
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Taehwa Research Forest

J. T. Sullivan / T. J. McGee / R. M. Stauffer / A. M. Thompson / A. Weinheimer / C. Knote / S. Janz / A. Wisthaler / R. Long / J. Szykman / J. Park / Y. Lee / S. Kim / D. Jeong / D. Sanchez / L. Twigg / G. Sumnicht / T. Knepp / J. R. Schroeder

Atmospheric Chemistry and Physics, Vol 19, Pp 5051-

a receptor site for severe domestic pollution events in Korea during 2016

2019 Volume 5067

Abstract: ... the remote Taehwa Research Forest (TRF) site and cause regulatory exceedances of ozone on 24 days. Two ...

Abstract	During the May–June 2016 International Cooperative Air Quality Field Study in Korea (KORUS-AQ), light synoptic meteorological forcing facilitated Seoul metropolitan pollution outflow to reach the remote Taehwa Research Forest (TRF) site and cause regulatory exceedances of ozone on 24 days. Two of these severe pollution events are thoroughly examined. The first, occurring on 17 May 2016, tracks transboundary pollution transport exiting eastern China and the Yellow Sea, traversing the Seoul Metropolitan Area (SMA), and then reaching TRF in the afternoon hours with severely polluted conditions. This case study indicates that although outflow from China and the Yellow Sea were elevated with respect to chemically unperturbed conditions, the regulatory exceedance at TRF was directly linked in time, space, and altitude to urban Seoul emissions. The second case studied, which occurred on 9 June 2016, reveals that increased levels of biogenic emissions, in combination with amplified urban emissions, were associated with severe levels of pollution and a regulatory exceedance at TRF. In summary, domestic emissions may be causing more pollution than by transboundary pathways, which have been historically believed to be the major source of air pollution in South Korea. The case studies are assessed with multiple aircraft, model (photochemical and meteorological) simulations, in situ chemical sampling, and extensive ground-based profiling at TRF. These observations clearly identify TRF and the surrounding rural communities as receptor sites for severe pollution events associated with Seoul outflow, which will result in long-term negative effects to both human health and agriculture in the affected areas.
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	333
Language	English
Publishing date	2019-04-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: 16S rRNA Gene Amplicon Sequencing of Contaminated Coastal Sediment Collected from the Taehwa River Estuary, South Korea.

Woo, Hee-Eun / Lee, Junho / Kim, Jong-Oh / Lee, In-Cheol / Yoon, Seokjin / Kim, Kyunghoi

Microbiology resource announcements

2021 Volume 10, Issue 19

Abstract: The Taehwa River Estuary is one of the largest enclosed bays in east Korea. In order to understand ... the environment of the Taehwa River Estuary, the microbial diversity in the sediment of the estuary was ...

Abstract	The Taehwa River Estuary is one of the largest enclosed bays in east Korea. In order to understand the environment of the Taehwa River Estuary, the microbial diversity in the sediment of the estuary was investigated through 16S rRNA gene sequencing. The predominant phyla in all locations were
Language	English
Publishing date	2021-05-13
Publishing country	United States
Document type	Journal Article
ISSN	2576-098X
ISSN (online)	2576-098X
DOI	10.1128/MRA.00230-21
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: A Case Study of Tidal Analysis Using Theory-Based Artificial Intelligence Techniques for Disaster Management in Taehwa River, South Korea

Kareem, Kola Yusuff / Seong, Yeonjeong / Kim, Kyungtak / Jung, Younghun

Water. 2022 July 09, v. 14, no. 14

2022

Abstract: ... such a precision. The Taehwa River in Ulsan City, Korea experiences tidal currents in the estuary that drains ... Results show that Taehwa tides are categorized as semidiurnal tides based on a computed form ratio of 0 ...

Abstract	Monitoring tidal dynamics is imperative to disaster management because it requires a high level of precision to avert possible dangers. Good knowledge of the physical drivers of tides is vital to achieving such a precision. The Taehwa River in Ulsan City, Korea experiences tidal currents in the estuary that drains into the East Sea. The contribution of wind to tide prediction is evaluated by comparing tidal predictions using harmonic analysis and three deep learning models. Harmonic analysis is conducted on hourly water level data from 2010–2021 using the commercial pytides toolbox to generate constituents and predict tidal elevations. Three deep learning models of long short-term memory (LSTM), gated recurrent unit (GRU), and bi-directional lstm (BiLSTM) are fitted to the water level and wind speed to evaluate wind and no-wind scenarios. Results show that Taehwa tides are categorized as semidiurnal tides based on a computed form ratio of 0.2714 in a 24-h tidal cycle. The highest tidal range of 0.60 m is recorded on full moon spring tide indicating the significant lunar pull. Wind effect improved tidal prediction NSE of optimal LSTM model from 0.67 to 0.90. Knowledge of contributing effect of wind will inform flood protection measures to enhance disaster preparedness.
Keywords	artificial intelligence ; case studies ; disaster preparedness ; estuaries ; flood control ; neural networks ; prediction ; rivers ; tides ; water ; wind speed ; South Korea
Language	English
Dates of publication	2022-0709
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2521238-2
ISSN	2073-4441
ISSN	2073-4441
DOI	10.3390/w14142172
Database	NAL-Catalogue (AGRICOLA)

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Article: Taehwa Research Forest: A receptor site for severe domestic pollution events in Korea during 2016.

Sullivan, John T / McGee, Thomas J / Stauffer, Ryan M / Thompson, Anne M / Weinheimer, Andrew / Knote, Christoph / Janz, Scott / Wisthaler, Armin / Long, Russell / Szykman, James / Park, Jinsoo / Lee, Youngjae / Kim, Saewung / Jeong, Daun / Sanchez, Dianne / Twigg, Laurence / Sumnicht, Grant / Knepp, Travis / Schroeder, Jason R

Atmospheric chemistry and physics

2019 Volume 19, Issue 7, Page(s) 5051–5067

Abstract: ... the remote Taehwa Research Forest (TRF) site and cause regulatory exceedances of ozone on 24 days. Two ...

Abstract	During the May-June 2016 International Cooperative Air Quality Field Study in Korea (KORUS-AQ), light synoptic meteorological forcing facilitated Seoul metropolitan pollution outflow to reach the remote Taehwa Research Forest (TRF) site and cause regulatory exceedances of ozone on 24 days. Two of these severe pollution events are thoroughly examined. The first, occurring on 17 May 2016, tracks transboundary pollution transport exiting eastern China and the Yellow Sea, traversing the Seoul Metropolitan Area (SMA), and then reaching TRF in the afternoon hours with severely polluted conditions. This case study indicates that although outflow from China and the Yellow Sea were elevated with respect to chemically unperturbed conditions, the regulatory exceedance at TRF was directly linked in time, space, and altitude to urban Seoul emissions. The second case studied, occurring on 09 June 2016, reveals that increased levels of biogenic emissions, in combination with amplified urban emissions, were associated with severe levels of pollutions and a regulatory exceedance at TRF. In summary, domestic emissions may be causing more pollution than by trans-boundary pathways, which have been historically believed to be the major source of air pollution in South Korea. The case studies are assessed with multiple aircraft, model (photochemical and meteorological) simulations, in-situ chemical sampling, and extensive ground-based profiling at TRF. These observations clearly identify TRF and the surrounding rural communities as receptor sites for severe pollution events associated with Seoul outflow, which will result in long-term negative effects to both human health and agriculture in the affected areas.
Language	English
Publishing date	2019-09-18
Publishing country	Germany
Document type	Journal Article
ISSN	1680-7316
ISSN	1680-7316
DOI	10.5194/acp-19-5051-2019
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Mobility and source apportionment of As and heavy metals in the Taehwa River sediment, South Korea: anthropogenic and seasonal effects

Shin, Ji-Hwan / Jo, Duk-Hee / Kim, Yeongkyoo

Environmental earth sciences. 2021 Feb., v. 80, no. 3

2021

Abstract: ... sources. It can be a potential pollutant source in varying environmental conditions. The Taehwa River runs ...

Abstract	The river sediment is a sink for heavy metals flowed into a river from natural and anthropogenic sources. It can be a potential pollutant source in varying environmental conditions. The Taehwa River runs through Ulsan City with different geological terrains and different land uses. Hence, research on the determination of various factors affecting accumulation and mobility changes in heavy metals in the river sediment is important. The present research investigated the mineralogical compositions of the Taewha River sediment in addition to the distribution, speciation, sources, and contamination level of As and heavy metals. The sediment showed different mineralogical changes associated with flowing distance, indicating the influence of country rocks, comprising igneous rocks in the upper stream region and sedimentary rocks in the lower stream region, on mineral composition. The total concentrations of As and heavy metals in the sediment exhibited the order of Zn > Pb > Cr > Cu > Ni > As > Cd. The overall concentrations of As and heavy metals increased in the downstream region, albeit with varying degrees. According to the Environmental Protection Agency guideline for sediment pollution, including the index of pollution intensity (IPOLL) and the potential ecological risk index (RI), the sediment in the sampling stations was discovered to be polluted to varying degrees from anthropogenic activities. An abrupt increase in Pb, Zn, and Cd concentrations was observed at Station 3 in summer and fall, which was linked to the increased clay mineral content caused by seasonal and lithological changes. The sources of this increase can be attributed to a nearby industrial complex or the oxidation of sulfide minerals, which could be related to an abandoned amethyst mine. Sequential extraction studies show that potential toxicity varies for each metal. By comparison, metals such as Cr, Ni, and Cu with higher percentages in exchangeable fractions and fractions bound to carbonates can be highly toxic. The statistical analysis indicates that two groups of metals, one including Zn, Cd, and Pb and another including Cr, Ni, As, and Cu, had distinct origins.
Keywords	clay ; environmental protection ; guidelines ; mineral content ; oxidation ; pollutants ; risk ; rivers ; sediment contamination ; sediments ; statistical analysis ; streams ; sulfides ; summer ; toxicity ; South Korea
Language	English
Dates of publication	2021-02
Size	p. 79.
Publishing place	Springer Berlin Heidelberg
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2493699-6
ISSN	1866-6299 ; 1866-6280
ISSN (online)	1866-6299
ISSN	1866-6280
DOI	10.1007/s12665-021-09371-6
Database	NAL-Catalogue (AGRICOLA)

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Article: Diversity and seasonal variation of endophytic fungi isolated from three conifers in mt. Taehwa, Korea.

Kim, Chang-Kyun / Eo, Ju-Kyeong / Eom, Ahn-Heum

Mycobiology

2013 Volume 41, Issue 2, Page(s) 82–85

Abstract: The needled leaves of three conifer species were collected in Mt. Taehwa during different seasons ...

Abstract	The needled leaves of three conifer species were collected in Mt. Taehwa during different seasons of the year. Total 59 isolates and 19 species of endophytic fungi were isolated from the leaves and identified using morphological and molecular characteristics. As a result, Shannon index was different in its host plant; Larix kaempferi had a highest value of species diversity. According to the sampling season, 9 species of 19 species were isolated during fall season. The results suggest that the existing of host plant and sampling season are major factors of distribution of endophytic fungi.
Language	English
Publishing date	2013-06-30
Publishing country	Korea (South)
Document type	Journal Article
ZDB-ID	2631580-4
ISSN	2092-9323 ; 1229-8093
ISSN (online)	2092-9323
ISSN	1229-8093
DOI	10.5941/MYCO.2013.41.2.82
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Source signatures from combined isotopic analyses of PM2.5 carbonaceous and nitrogen aerosols at the peri-urban Taehwa Research Forest, South Korea in summer and fall

Lim, Saehee / Meehye Lee / Claudia I. Czimczik / Taekyu Joo / Sandra Holden / Gergana Mouteva / Guaciara M. Santos / Xiaomei Xu / Jennifer Walker / Saewung Kim / Hyun Seok Kim / Soyoung Kim / Sanguk Lee

Science of the total environment. 2019 Mar. 10, v. 655

2019

Abstract: ... stable carbon, and stable nitrogen isotopic composition of PM2.5 at Taehwa Research Forest (TRF) near ...

Abstract	Isotopes are essential tools to apportion major sources of aerosols. We measured the radiocarbon, stable carbon, and stable nitrogen isotopic composition of PM2.5 at Taehwa Research Forest (TRF) near Seoul Metropolitan Area (SMA) during August–October 2014. PM2.5, TC, and TN concentrations were 19.4 ± 10.1 μg m−3, 2.6 ± 0.8 μg C m−3, and 1.4 ± 1.4 μg N m−3, respectively. The δ13C of TC and the δ15N of TN were − 25.4 ± 0.7‰ and 14.6 ± 3.8‰, respectively. EC was dominated by fossil-fuel sources with Fff (EC) of 78 ± 7%. In contrast, contemporary sources were dominant for TC with Fc (TC) of 76 ± 7%, revealing the significant contribution of contemporary sources to OC during the growing season. The isotopic signature carries more detailed information on sources depending on air mass trajectories. The urban influence was dominant under stagnant condition, which was in reasonable agreement with the estimated δ15N of NH4+. The low δ15N (7.0 ± 0.2‰) with high TN concentration was apparent in air masses from Shandong province, indicating fossil fuel combustion as major emission source. In contrast, the high δ15N (16.1 ± 3.2‰) with enhanced TC/TN ratio reveals the impact of biomass burning in the air transported from the far eastern border region of China and Russia. Our findings highlight that the multi-isotopic composition is a useful tool to identify emission sources and to trace regional sources of carbonaceous and nitrogen aerosols.
Keywords	aerosols ; air ; ammonium ; autumn ; biomass ; burning ; carbon ; forests ; fossil fuels ; fuel combustion ; growing season ; metropolitan areas ; nitrogen ; particulates ; stable isotopes ; summer ; China ; Russia ; South Korea
Language	English
Dates of publication	2019-0310
Size	p. 1505-1514.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2018.11.157
Database	NAL-Catalogue (AGRICOLA)

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Article: Development of Allometric Equations for V Age-class Pinus koraiensis in Mt. Taehwa Plantation, Gyeonggi-do

Ryu, D.U., Seoul National University, Seoul, Republic of Korea / Moon, M.K., Seoul National University, Seoul, Republic of Korea / Park, J.H., Seoul National University, Seoul, Republic of Korea / Cho, S.S., Seoul National University, Seoul, Republic of Korea / Kim, T.K., National Institute of Environmental Research, Incheon, Republic of Korea / Kim, H.S., Seoul National University, Seoul, Republic of Korea

Korean Journal of Agricultural and Forest Meteorology

(Mar 2014) Volume v. 16, Issue (1), Page(s) p. 29–38

Abstract: Allometric equations for leaf, branch, stem and total above ground biomass of Pinus koraeinsis trees were developed with diameter at breast height(DBH) of trees, which were growing in a pine plantation with the stand density of 410 tree ha-1 and the ... ...

Abstract	Allometric equations for leaf, branch, stem and total above ground biomass of Pinus koraeinsis trees were developed with diameter at breast height(DBH) of trees, which were growing in a pine plantation with the stand density of 410 tree ha-1 and the average DBH of 29.1±5.2 cm in Mt. Taewha, Gyeonggi. Damage by Acantholyda parki reduced leaf biomass compared to other studies, however, its contribution to total biomass was minimal among parts. Comprehensive analysis revealed that constant in allometric equation for total above ground biomass (logY=a + blogX) was affected by average DBH and stand density, however, constant b was not. At the stand level, biomass for leaf, brach, stem, total above ground biomass were 6.68 Mg ha-1, 18.82 Mg ha-1, 101.02 Mg ha-1, 126.53 Mg ha-1, respectively. We developed a Korean pine stand biomass regression, which explained about 98% of variation with DBH and stand density based on comprehensive analysis.
Keywords	CONIFEROUS FORESTS ; CONIFEROUS FORESTS ; PINUS ; STEMS ; FORET RESINEUSE ; FORET RESINEUSE ; PINUS ; TIGE ; BOSQUE DE CONIFERAS ; BOSQUE DE CONIFERAS ; PINUS ; TALLOS
Language	Korean
Document type	Article
ISSN	1229-5671
Database	AGRIS - International Information System for the Agricultural Sciences and Technology

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Article: Diversity and Seasonal Variation of Endophytic Fungi Isolated from Three Conifers in Mt. Taehwa, korea

Kim, C.K., korea National University, Cheongwon, Republic of korea / Eo, J.K., korea National University, Cheongwon, Republic of korea / Eom, A.H., korea National University, Cheongwon, Republic of korea

Mycobiology

(Jun 2013) Volume v. 41, Issue (2), Page(s) p. 82–85

Abstract: The needled leaves of three conifer species were collected in MT. Taehwa during different seasons ...

Abstract	The needled leaves of three conifer species were collected in MT. Taehwa during different seasons of the year. Total 59 isolates and 19 species of endophytic fungi were isolated from the leaves and identified using morhological and molecular characteristics. As a result, Shannon index was different in its host plant; Larix kaempferi had a highest value of species diversity. According to the sampling season, 9 species of 19 species were isolated during fall season. The results suggest that the existing of host plant and sampling season are major factors of distribution of endophytic fungi.
Keywords	ENDOFITAS ; BIODIVERSITE ; ENDOPHYTE ; CONIFERALES ; ENDOPHYTES ; CONIFERALE ; BIODIVERSITY ; BIODIVERSIDAD
Language	English
Document type	Article
ISSN	1229-8093
Database	AGRIS - International Information System for the Agricultural Sciences and Technology

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