Impact of strong El Niño events (1997/98 and 2009/10) on sinking particle fluxes in the 10°N thermocline ridge area of the northeastern equatorial Pacific

Kim, Hyung Jeek; Hyeong, Kiseong; Yoo, Changsik; Khim, Boo Keun; Kim, Kyeong Hong; Son, Ju Won; Kug, Jong‐Seong; Park, Jong Yeon; Kim, Dong-Seon

doi:10.1016/j.dsr.2012.05.008

Cited by 16 publications

(13 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This seasonal variability correlates with the migration of the ITCZ (Kim et al 2010(Kim et al , 2011. Interannual variability in total mass flux in the CCZ was closely related to the ENSO cycle (Dymond and Collier 1988;Honjo et al 1995;Kim et al 2011Kim et al , 2012. The average contribution of each component decreased in the following order: CaCO 3 , lithogenic material, biogenic silica, and organic carbon, with values of 39.8%, 25.1%, 18.7%, and 8.4%, respectively.…”

Section: Sinking Particle Flux At Station Komomentioning

confidence: 81%

“…Korea Institute of Ocean Science & Technology (KIOST, formerly known as KORDI) has completed a number of studies in the manganese nodule fields of the CCZ since 1997, including examination of the abundance of manganese nodules, deep-sea environmental properties, and particle fluxes ( Figure 1) (Jeong et al 1996;Jung et al 2001;Hyun and Yang 2005;Kim et al 2010Kim et al , 2011Kim et al , 2012. In general, meteorological and hydrographic conditions at Station KOMO (Korea Ocean Research & Development Institute Long-term Monitoring Station: 10 30 0 N, 131 20 0 W; ca.…”

Section: Study Areamentioning

confidence: 99%

“…A time-series sediment trap (PARFLUX Mark 78G-21, McLane) was deployed at a depth of 4950 m for eight years (July 1997to May 1998, and July 2003to June 2010 at Station KOMO ( Figure 1) (Kim et al 2011(Kim et al , 2012, and particle flux data from this site have been published previously (Kim et al 2011(Kim et al , 2012. Briefly, the total mass flux varied between 3.5 and 130 mg m À2 day À1 , with an average of 28 AE 23 mg m À2 day À1 (n ¼ 86) over the sampling period (Figure 2a).…”

Section: Sinking Particle Flux At Station Komomentioning

confidence: 99%

“…However, as noted by Parthiban (2000), the difference in particle flux alone between the two periods was insufficient to differentiate between the primary flux from the overlying water column and the resuspended particle flux. In the CCZ of the northeastern equatorial Pacific, particle flux shows large natural variability due to the seasonal migration of the intertropical convergence zone (ITCZ) and differing ENSO (El Niño-Southern Oscillation) conditions (Kim et al 2010(Kim et al , 2011(Kim et al , 2012. Therefore, it will be necessary to decouple the impact of mining from the natural variability in particle flux to quantitatively determine the contribution of resuspended particles derived from mining operations.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of Resuspended Sediments to Sinking Particles by Benthic Disturbance in the Clarion-Clipperton Nodule Fields

Kim

Hyeong

et al. 2014

Marine Georesources & Geotechnology

Self Cite

View full text Add to dashboard Cite

The geochemical properties of sinking particles and sediments in the Clarion-Clipperton Zone were examined to develop a quantitative indicator with which to evaluate the contribution of sediment resuspended by nodule mining activity to sinking particles. The ratio of lithogenic material to organic carbon varies from $3 in sinking particles to $211 in sediments. This ratio is easily measured and is not easily affected by degradation and=or dissolution in the water column. A mixing model indicates that the ratio may be used as a potential proxy for estimating the contribution of resuspended sediment derived from mining operations to sinking particles.

show abstract

Section: Sinking Particle Flux At Station Komomentioning

confidence: 81%

Section: Study Areamentioning

confidence: 99%

Section: Sinking Particle Flux At Station Komomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of Resuspended Sediments to Sinking Particles by Benthic Disturbance in the Clarion-Clipperton Nodule Fields

Kim

Hyeong

et al. 2014

Marine Georesources & Geotechnology

Self Cite

View full text Add to dashboard Cite

show abstract

“…이에 따라 태평양 및 인도양에서 망간단괴 광구 탐사권을 보유한 일부 국가들은 자국의 광구지역 또는 그 주변지역에서 해양물리, 화학, 저서생물, 지질학적 특성 등의 환경연구와 심해퇴적물 교란기를 이용한 충격시험을 수행하였다 (Ozturgut et al 1980;Trueblood et al 1997;Chung et al 2001;Sharma et al 2001). 남동태평양에서 약 10년간 수행된 독일의 충격시험(Disturbance and Recolonisation Experiment, DISCOL)에서는 충격시험 이 후 중형저서동물인 선충류(Nematode)와 저서성 요각류 (Harpacticoida)의 개체수가 50% 정도 감소한 것으로 보 고되었다 (Schriever et al 1991(Schriever et al , 1992(Schriever et al , 2002Thiel 1992;Thiel et al 2001 )에 비해 약 3배 증가하였으며, 5일 후에 는 평상시기보다 1.5~2배 높게 측정되어 비교적 빠른 재 퇴적 과정을 제시하였고 (Parthiban 2000;Sharma et al 2001), 재부유 물질의 영향으로 충격시험 기간동안 초대형 저서동물의 개체수가 32% 정도 감소한 것으로 보고되었 다 (Rodrigues et al 2001 (Dymond and Collier 1988;Honjo et al 1995;Karl et al 1995;Chavez et al 1999;Kim et al 2010Kim et al , 2011Kim et al , 2012 (Talley 1991;Bostock et al 2010). Fig.…”

unclassified

Evaluation of Similarity of Water Column Properties and Sinking Particles between Impact and Preserved Sites for Environmental Impact Assessment in the Korea Contracted Area for Manganese Nodule Development, NE Pacific

손주원¹,

김경홍²,

김형직³

et al. 2014

Ocean and Polar Research

Self Cite

View full text Add to dashboard Cite

: Verifying the similarity of environmental characteristics between an artificial impact site and a preserved or reference site is necessary to quantitatively and qualitatively evaluate the environmental impact of mining activity. Although an impact site (BIS station) and a preserved site (called KOMO station) that have been selected in the Korea manganese nodule contract area may share similar environmental characteristics, similarities in terms of the water column environment between both sites has not been investigated. In this study, we compared the chemical properties of the water columns and sinking particle fluxes between BIS and KOMO stations through two observations (August 2011 and September 2012). Additionally, we observed particle fluxes at the KOMO station for five years (July 2003~July 2008) to understand long-term natural variability. Vertical distributions of water column properties such as dissolved oxygen, inorganic nutrients (N, P, Si), total organic carbon below surface layer (within the depth range of 200 m) were not considerably different between the two sites. Especially, values of water column parameters in the abyssopelagic zone from 4000 m to bottom layer (~5000 m) were very similar between the BIS and KOMO sites. Sinking particle fluxes from the two sites also showed similar seasonality. However, natural variation of particle flux at the KOMO site varied from 3.5 to 129.9 mg m −2 day, with a distinct temporal variation originating from ENSO events (almost forty times higher than a minimum value). These results could provide valuable information to more exactly evaluate the environmental impact of mining activity on water columns.

show abstract

Historical reconstruction of organic carbon decay and preservation in sediments on the East China Sea shelf

Bianchi

Chapman

et al. 2013

JGR Biogeosciences

View full text Add to dashboard Cite

[1] Sediment cores were collected from the East China Sea inner shelf in 2010 to study the decay and preservation of organic carbon (OC). The highest sediment mass accumulation rate (0.61 ± 0.20 g cm À2 yr À1 ), derived from 210 Pb, was found near the river mouth and decreased alongshore to the south (0.17 ± 0.004 g cm À2 yr À1 ), and in an offshore direction (0.31 ± 0.08 g cm À2 yr À1 ). Average total OC content was higher at inner shelf stations (0.52%) than those offshore (0.38%). The δ 13 C was more depleted at nearshore (À23.49‰ to À21.97‰) than offshore (À22.49‰ to À21.60‰) stations. Principal component analysis indicated that terrestrial OC, as indicated by lignin-phenols (Λ 8 ) values, was preserved in sediment closer to the coast (0.22-0.44), while offshore sediment was more composed of lignin-poor (0.12-0.24) degraded OC that was likely hydrodynamically sorted. Marine-derived OC, as indicated by plant pigments, was significantly more abundant in the sediment mixed layer than the underlying accumulation layer. Historical flooding events were detected in Λ 8 profiles in two of the six cores located at midshelf stations. Despite the magnitude of the 2010 flood in East China, we did not see any signature of this event with the chemical biomarker in these two cores. This may suggest that reduced sediment loading due to recent dam construction may have greatly decoupled river inputs with sediment loading to shelf sediment. The total OC standing stock since 1900 was approximately 1.62 ± 1.15 kg C m À2 , about one tenth of all the middle and lower lakes in the Changjiang catchment basin. This work further supports the need for more research to better understand how the reduced inputs of fluvial input of sediments from Chinese rivers (due to river diversions and dams) affect carbon cycling in the East China Sea.Citation: Li, X., T.

show abstract

Impact of strong El Niño events (1997/98 and 2009/10) on sinking particle fluxes in the 10°N thermocline ridge area of the northeastern equatorial Pacific

Cited by 16 publications

References 58 publications

Evaluation of Resuspended Sediments to Sinking Particles by Benthic Disturbance in the Clarion-Clipperton Nodule Fields

Evaluation of Resuspended Sediments to Sinking Particles by Benthic Disturbance in the Clarion-Clipperton Nodule Fields

Evaluation of Similarity of Water Column Properties and Sinking Particles between Impact and Preserved Sites for Environmental Impact Assessment in the Korea Contracted Area for Manganese Nodule Development, NE Pacific

Historical reconstruction of organic carbon decay and preservation in sediments on the East China Sea shelf

Contact Info

Product

Resources

About