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Revisiting ENSO/Indian Ocean Dipole phase relationships : REVISITING ENSO/IOD PHASE RELATIONSHIPS
Stuecker, Malte F.,Timmermann, Axel,Jin, Fei-Fei,Chikamoto, Yoshimitsu,Zhang, Wenjun,Wittenberg, Andrew T.,Widiasih, Esther,Zhao, Sen American Geophysical Union 2017 Geophysical research letters Vol.44 No.5
Polar amplification dominated by local forcing and feedbacks
Stuecker, Malte F.,Bitz, Cecilia M.,Armour, Kyle C.,Proistosescu, Cristian,Kang, Sarah M.,Xie, Shang-Ping,Kim, Doyeon,McGregor, Shayne,Zhang, Wenjun,Zhao, Sen,Cai, Wenju,Dong, Yue,Jin, Fei-Fei Nature Publishing Group 2018 Nature climate change Vol.8 No.12
최신 기후모형 실험 (CESM2 pacemaker)으로 규명한 엘니뇨와 북극기온의 원격상관
정혜인,박효석,Malte Stuecker,예상욱 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
엘니뇨 남방진동(ENSO)은 전지구 기후 변동성의 가장 영향력 있는 기후모드이다. ENSO에 의한 중위도 기후 영향이 광범위하게 연구되었지만, 북극을 포함한 고위도 기후에 대한 ENSO의 영향은 여전히 파악하기 쉽지 않아 논란의 여지가 많이 남아있다. 본 연구에서는 CMIP6에 참여하는 모형 중 하나인 CESM2 기후모형을 이용하여, 주요 엘니뇨 기간 동안 북극 지표기온이 남아메리카 근처의 적도 극동 태평양 해수면온도 변화에 매우 민감하다는 것을 발견했다. 금세기 가장 강력했던 엘니뇨 기간 즉, 1982-83년, 1997-98년, 2015-16년 겨울철 동안 북극 지표 기온 아노말리는 각각 1°C 이상의 매우 따뜻한 기온, -2°C 이하의 매우 차가운 기온, 0.5°C 이상의 비교적 따뜻한 기온 분포를 보였는데, CESM2 모형을 이용하여 해수면온도를 열대 지역 (15°S-15°N, 0-360°E)에 넛징(Nudging)한 앙상블 실험은 관측에서 보인 북극 지표기온 특징을 매우 잘 모의해 냈다. 이는 강력했던 엘니뇨 기간 동안 열대 해수면 온도 변화로부터 북극 지표 기온 변화의 많은 부분을 설명 가능하다는 것을 의미한다. 한편, 동태평양 엘니뇨 (EP type El Niño)로 널리 알려진 1982-83년과 1997-98년 겨울철 동안 서로 다른 부호의 북극 기온분포를 보인 원인을 규명하기 위해 여러 이상화된 실험 (Idealized Experiment)을 추가로 수행했다. 그 결과, 1997-98년 엘니뇨 기간 동안 북극 지표기온 냉각이 적도 극동 태평양의 변칙적으로 높은 해수면온도에 의해 유도되었음이 밝혀졌다. 반면, 1982-83년 엘니뇨는 동태평양 엘니뇨 그룹에 속하지만, 적도 극동 태평양 해수면 온도가 1997-98년 보다 낮아서 북극지표기온이 오히려 따뜻했다. 본 연구에서 얻어진 결과는 동태평양 해수면온도의 매우 작은 차이가 멀리 떨어진 북극지역의 전혀 다른 기온 변화를 초래할 수 있음을 나타내며, 이는 정확한 북극 기후 예측을 위해 ENSO 진폭 및 패턴의 예측 모의가 중요함을 강조한다.
최상돈,장미숙,Tara Stuecker,Christine Chung,David A. Newcombe,Kasthuri Venkateswaran 한국유전체학회 2012 Genomics & informatics Vol.10 No.4
In this study, fosmid cloning strategies were used to assess the microbial populations in water from the International Space Station (ISS) drinking water system (henceforth referred to as Prebiocide and Tank A water samples). The goals of this study were: to compare the sensitivity of the fosmid cloning strategy with that of traditional culture-based and 16S rRNA-based approaches and to detect the widest possible spectrum of microbial populations during the water purification process. Initially, microbes could not be cultivated, and conventional PCR failed to amplify 16S rDNA fragments from these low biomass samples. Therefore, randomly primed rolling-circle amplification was used to amplify any DNA that might be present in the samples, followed by size selection by using pulsed-field gel electrophoresis. The amplified high-molecular- weight DNA from both samples was cloned into fosmid vectors. Several hundred clones were randomly selected for sequencing,followed by Blastn/Blastx searches. Sequences encoding specific genes from Burkholderia, a species abundant in the soil and groundwater, were found in both samples. Bradyrhizobium and Mesorhizobium, which belong to rhizobia, a large community of nitrogen fixers often found in association with plant roots, were present in the Prebiocide samples. Ralstonia,which is prevalent in soils with a high heavy metal content, was detected in the Tank A samples. The detection of many unidentified sequences suggests the presence of potentially novel microbial fingerprints. The bacterial diversity detected in this pilot study using a fosmid vector approach was higher than that detected by conventional 16S rRNA gene sequencing.
Choi, Sangdun,Chang, Mi Sook,Stuecker, Tara,Chung, Christine,Newcombe, David A.,Venkateswaran, Kasthuri Korea Genome Organization 2012 Genomics & informatics Vol.10 No.4
In this study, fosmid cloning strategies were used to assess the microbial populations in water from the International Space Station (ISS) drinking water system (henceforth referred to as Prebiocide and Tank A water samples). The goals of this study were: to compare the sensitivity of the fosmid cloning strategy with that of traditional culture-based and 16S rRNA-based approaches and to detect the widest possible spectrum of microbial populations during the water purification process. Initially, microbes could not be cultivated, and conventional PCR failed to amplify 16S rDNA fragments from these low biomass samples. Therefore, randomly primed rolling-circle amplification was used to amplify any DNA that might be present in the samples, followed by size selection by using pulsed-field gel electrophoresis. The amplified high-molecular- weight DNA from both samples was cloned into fosmid vectors. Several hundred clones were randomly selected for sequencing, followed by Blastn/Blastx searches. Sequences encoding specific genes from Burkholderia, a species abundant in the soil and groundwater, were found in both samples. Bradyrhizobium and Mesorhizobium, which belong to rhizobia, a large community of nitrogen fixers often found in association with plant roots, were present in the Prebiocide samples. Ralstonia, which is prevalent in soils with a high heavy metal content, was detected in the Tank A samples. The detection of many unidentified sequences suggests the presence of potentially novel microbial fingerprints. The bacterial diversity detected in this pilot study using a fosmid vector approach was higher than that detected by conventional 16S rRNA gene sequencing.