Letter
Geosciences, Multidisciplinary
Mochamad Furqon Azis Ismail, Johannes Karstensen, Joachim Ribbe, Taslim Arifin, Handy Chandra, Rudhy Akhwady, Erma Yulihastin, Abdul Basit, Asep Sandra Budiman
Summary: For the first time, the processes controlling the variations of mixed layer temperature (MLT) and salinity (MLS) in the Banda Sea were quantified using data from a single Argo float in combination with satellite and reanalysis outputs. The study revealed the presence of a barrier layer and identified the main contributors to the seasonal variability of MLT and MLS. Heat gains and losses at the air-sea interface were found to be the primary factor affecting MLT, while MLS changes were driven by advection of low salinity water.
GEOSCIENCE LETTERS
(2023)
Article
Oceanography
Zekai Ni, Jiancheng Yu, Xuekun Shang, Wenming Jin, Yeteng Luo, Philip A. Vetter, Huichang Jiang, Liu Yu, Sumin Liu, Hongzhou Xu
Summary: The study investigated the evolution of thermohaline structure during three tropical cyclones in the Northwest Pacific through observations by underwater gliders in fall 2018. Results showed significant changes in temperature, salinity, and layer structures in response to the cyclones, with the mixed layer experiencing cooling-to-warming transitions and stratification destructing-to-reconstructing processes.
ACTA OCEANOLOGICA SINICA
(2021)
Article
Geosciences, Multidisciplinary
Zheliang Zhang, Zhanhong Ma, Jianfang Fei, Yunxia Zheng, Jiancheng Huang
Summary: This study investigates the impact of tropical cyclones on the thickness of the barrier layer through observations and numerical simulations. Statistical results show that the thickness of the barrier layer increases significantly as the cyclone approaches, reaching its maximum 1-5 days after the cyclone passes, and returning to its pre-storm state within 30 days on average. The study also reveals that precipitation and vertical mixing associated with tropical cyclones play a role in increasing the thickness of the barrier layer.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Ding-Rong Wu, Zhe-Wen Zheng, Ganesh Gopalakrishnan, Chung-Ru Ho, Quanan Zheng
Summary: The study found that the impact of the barrier layer on tropical cyclone enhancement in the main development region of the Western North Pacific might be overestimated, and the barrier layer plays a key role in resisting sea surface cooling when it is strong enough.
Review
Multidisciplinary Sciences
Hui Christophersen, Jason Sippel, Altug Aksoy, Nancy L. Baker
Summary: This review provides an overview of data assimilation (DA) techniques used for tropical cyclones (TCs). The strengths and weaknesses of variational methods, ensemble methods, hybrid methods, and particle filter methods are discussed. Several global numerical weather prediction models and their corresponding DA systems commonly used for TC forecasting and verification are described, as well as the DA research and development efforts in the operational regional model from the National Centers for Environmental Prediction's Hurricane Weather Research and Forecasting. The review also focuses on TC observations from reconnaissance, ground-based radar, enhanced satellite-derived atmospheric motion vectors, and all-sky satellite radiances, and their impacts on TC analyses and forecasts, as well as recent advancements and challenges in TC DA.
ANNALS OF THE NEW YORK ACADEMY OF SCIENCES
(2022)
Review
Environmental Sciences
Adam H. Sobel, Allison A. Wing, Suzana J. Camargo, Christina M. Patricola, Gabriel A. Vecchi, Chia-Ying Lee, Michael K. Tippett
Summary: The frequency of tropical cyclones is influenced by global warming, but there is no consistent theory to explain the average number of TCs occurring each year on Earth. While global numerical models have improved simulations of TC activity, uncertainty remains in predicting changes in frequency.
Article
Oceanography
Qiwei Hu, Xiaoyan Chen, Xianqiang He, Yan Bai, Qingwen Zhong, Fang Gong, Qiankun Zhu, Delu Pan
Summary: This study found that phytoplankton biomass in the central tropical Indian Ocean exhibits significantly different trends at the near-surface and subsurface layers, which are primarily influenced by changes in the mixed layer and thermocline. These findings could help us understand the response of vertical phytoplankton to future climate change scenarios.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Meteorology & Atmospheric Sciences
Le-Yi Wang, Zhe-Min Tan
Summary: The study proposes a deep-learning parameterization scheme (DeepBL) for predicting turbulent flux in the tropical cyclone boundary layer. It outperforms the currently widely used parameterization method and demonstrates good interpretability.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Geochemistry & Geophysics
Guosheng Zhang, Chao Xu, Xiaofeng Li, Ziqiang Zhu, William Perrie
Summary: This study proposes a method to estimate the center location, intensity, and radius of maximum wind of tropical cyclones (TCs) using ocean winds observed by the Soil Moisture Active Passive (SMAP) radiometer. The method is validated by comparing the estimated hurricane centers and wind distributions with measurements from other instruments. The results demonstrate the significance of this simple method in estimating TC parameters from SMAP wind products, despite the low spatial resolution.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Environmental Sciences
Sanjiba Kumar Baliarsingh, Aneesh Anandrao Lotliker, Suchismita Srichandan, Chandanlal Parida, Rajdeep Roy, R. Chandrasekhar Naik, T. M. Balakrishnan Nair, Kamal Kumar Barik
Summary: The study found that there was a shift in phytoplankton pigment composition during tropical cyclone Fani, with a significant increase in chlorophyll-a and fucoxanthin concentrations during the post-cyclone phase, indicating a bloom of Bacillariophyta. The toxic Bacillariophyta species Pseudo-nitzschia pungens dominated during the post-cyclone phase.
MARINE POLLUTION BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
Daniel M. Gilford
Summary: Potential intensity (PI) is the maximum speed limit of a tropical cyclone, useful for evaluating and predicting cyclone intensity. The pyPI package develops the PI algorithm in Python, providing a flexible and validated tool for researchers.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2021)
Article
Environmental Sciences
Cameron Do, Georgia Elizabeth Saunders, Yuriy Kuleshov
Summary: This study attempts to expand the methodology of tropical cyclone risk assessment by focusing on coral reefs and to understand the risk to Australia's natural environment. The study found that the northern Ningaloo Reef and southern Great Barrier Reef regions had the highest risk values. However, the limitations in data quality mean that these results are only estimates at best.
Article
Meteorology & Atmospheric Sciences
Arjun U. Kumar, Nils Brueggemann, Roger K. Smith, Jochem Marotzke
Summary: Through simulation analysis of a tropical cyclone, we realize the importance of boundary-layer dynamics and air-sea interactions in the structural and intensity changes of tropical cyclones. The simulation shows that tropical cyclones weaken and reintensify when interacting with cold wakes and warm-core eddies.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2022)
Article
Oceanography
Vinu Valsala, A. G. Prajeesh, Shikha Singh
Summary: This study examines the interannual variability of the barrier layer in the tropical Indian Ocean and its relationship with the Indian Ocean Dipole Mode. The analysis is based on observations and outputs from an ocean general circulation model. The results show that the barrier layer thins in the eastern tropical Indian Ocean during the positive phase of the Indian Ocean Dipole Mode, while it thickens in the central-to-western region. The thinning in the east is primarily caused by upward heaving thermocline due to upwelling Kelvin waves, while the thickening in the central-to-western region is due to a combined action of salinity and freshwater forcing. The variability of the barrier layer in the tropical Indian Ocean can be largely explained by thermocline heaving, temperature and salinity dynamics, and buoyancy forcing.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Engineering, Marine
Kamran Koohestani, Mohammad Nabi Allahdadi, Nazanin Chaichitehrani
Summary: The study investigates the impact of Cyclone Gonu on sea surface temperature (SST) and mixed layer depth (MLD), establishing relationships between SST and MLD. The estimation method for MLD showed an average error of 15% compared to measured data, with inconsistencies attributed to the use of climatological temperature profiles not accurately representing pre-cyclone conditions.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
