Article
Geosciences, Multidisciplinary
Clara Deser, Adam S. Phillips
Summary: The study evaluates the skill of two methods in capturing the spatial pattern of internal AMV, with the first method mistakenly attributing the structure of forced climate change onto internal AMV, while the second method shows robustness to climate change. The models simulate realistic patterns of internal AMV, but the assessment is hindered by the brevity of the observational record.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Florian Boergel, Matthias Groeger, H. E. Markus Meier, Cyril Dutheil, Hagen Radtke, Leonard Borchert
Summary: We analyzed multidecadal temperature fluctuations of the Atlantic Ocean and their influence on Northern Europe, with a focus on the Baltic Sea. Through low-frequency component analysis, we identified modes of multidecadal variability in the Baltic Sea temperature signal and linked it to Atlantic climate variability. The study found that a large fraction of winter temperature variability in the Baltic Sea is related to Atlantic Multidecadal Variability (AMV), while the AMV does not influence summer and spring water temperatures.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
Xiaohe An, Bo Wu, Tianjun Zhou, Bo Liu
Summary: The study demonstrates that the SST in the North Pacific is tied to the AMO forcing through convective heating associated with precipitation over the tropical Pacific, rather than through SST. The convective heating drives SST variations in the North Pacific through a teleconnection, while weakening ENSO-like SST anomalies through a thermocline damping effect.
JOURNAL OF CLIMATE
(2021)
Article
Geosciences, Multidisciplinary
Liangjun Zhu, David J. Cooper, Shijie Han, Jingwen Yang, Yuandong Zhang, Zongshan Li, Huiying Zhao, Xiaochun Wang
Summary: The study analyzed the drought situation and driving mechanism in the northern Daxing'an Mountains of China, finding that drought patterns are consistent with other regions and demonstrate significant periodic peaks. The Atlantic Multidecadal Oscillation (AMO) plays a crucial role in influencing drought in the northern Daxing'an Mountains, particularly favoring drought during the cold phase of AMO.
Article
Multidisciplinary Sciences
Miao Fang, Xin Li, Hans W. Chen, Deliang Chen
Summary: Enhanced warming in the Arctic is influenced by factors such as sea ice and the Atlantic Multidecadal Oscillation. This study combines climate model simulations and proxy data to determine the important influences of these factors on Arctic amplification variations.
NATURE COMMUNICATIONS
(2022)
Article
Geosciences, Multidisciplinary
Hongyan Xu, Jiawei Fan, Hanchao Jiang, Xiaotong Wei, Yanming Yang, Wei Shi, Qiaoqiao Guo, Siqi Zhang
Summary: This study reconstructed the climate and landscape changes in the southern Altai Mountains over the past 3500 years using radiocarbon dating and pollen analysis. The findings show that the region experienced a humid climate, supporting the growth of taiga and steppe vegetation, during 1550 BCE-720 BCE. From 720 BCE-390 CE, the climate was warm and human activities increased. Desert-steppe developed in response to increased aridity and/or human activities during 390 CE-1560 CE. After 1560 CE, the taiga and steppe recovered due to a return to humid conditions. Human activities have been the key factor affecting vegetation in the past 2000 years.
Article
Multidisciplinary Sciences
Chengfei He, Amy C. Clement, Sydney M. Kramer, Mark A. Cane, Jeremy M. Klavans, Tyler M. Fenske, Lisa N. Murphy
Summary: The multidecadal variability in the tropical Atlantic climate is influenced by the cross-equatorial gradient in sea surface temperatures (SSTs), which is largely driven by radiative perturbations associated with anthropogenic emissions and volcanic aerosols. This relationship is obscured in models due to overestimations of warming trends in the Northern Hemisphere. However, when these overestimations are removed, correlations between SSTs and Atlantic hurricane formation and Sahel rainfall emerge, especially since 1950 when anthropogenic aerosol forcing has been high.
Article
Geography, Physical
S. Karachurina, N. Rudaya, L. Frolova, O. Kuzmina, X. Cao, V. Chepinoga, K. Stoof-Leichsenring, B. Biskaborn, U. Herzschuh, N. Nigmatullin, Y. Vnukovskaya, I. Grekov, L. Pestryakova
Summary: Using pollen analysis and metabarcoding of plant sedaDNA, the study reveals the floristic diversity and dominant tree species in the vicinity of Lake Balyktukel, Altai Mountains, over the past 7,000 years. The sedaDNA method identified significantly more taxa compared to traditional pollen analysis, highlighting the dominance of Larix over Pinus. The study also reconstructs past climate conditions and indicates a correlation between maximum phytodiversity and humid phases.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
Christopher H. H. O'Reilly, Matthew Patterson, Jon Robson, Paul Arthur Monerie, Daniel Hodson, Yohan Ruprich-Robert
Summary: This study finds that experiments with active SST-restoring in the Tropical North Atlantic exaggerate the positive surface heat-fluxes out of the ocean with warm SST anomalies, which is not observed in other simulations. These upward surface heat-fluxes play a crucial role in generating a strong local precipitation response and the associated remote impact on the Pacific Walker circulation, but are absent in other simulations. The results of this study suggest that the influence of the Atlantic on global climate anomalies and its role in recent multidecadal SST trends are overestimated in experiments employing SST-restoring in the Tropical North Atlantic.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
Article
Multidisciplinary Sciences
Simon L. L. Michel, Didier Swingedouw, Pablo Ortega, Guillaume Gastineau, Juliette Mignot, Gerard McCarthy, Myriam Khodri
Summary: This study reconstructs the Atlantic multidecadal variability over the past millennium using a paleoclimate database and a statistical framework. It finds that the memory in variations of Atlantic multidecadal variability has increased recently, which may be a potential early warning signal for the approach of a North Atlantic tipping point.
NATURE COMMUNICATIONS
(2022)
Letter
Geosciences, Multidisciplinary
Huanping Huang, William D. Collins, Christina M. Patricola, Yohan Ruprich-Robert, Paul A. Ullrich, Alexander J. Baker
Summary: This research examines the impact of Atlantic Multidecadal Variability (AMV) on global tropical cyclones (TCs) using idealized climate model simulations. The results show that TC frequency in the North Atlantic increases significantly under warmer sea surface temperature, higher humidity, increased vorticity, and weaker vertical wind shear conditions associated with AMV+. Conversely, TC occurrence decreases in the western North Pacific and South Pacific due to stronger wind shear and lower humidity associated with AMV+. The contrasting responses are attributed to the strengthened Walker Circulation between the Atlantic and Pacific.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Clara Deser, Adam S. S. Phillips
Summary: The commonly used global temperature residual method for isolating the internal component of AMV is investigated using model Large Ensembles. It is found that this method introduces spurious connections over the Indo-Pacific region, which can be overcome by using the forced component of global temperature in the residual method.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Jiaqing Xue, Jing-Jia Luo, Wenjun Zhang, Toshio Yamagata
Summary: The interactions between El Nino-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) have significant implications for global climate variability and seasonal climate predictions. Observational analysis suggests that the relationship between ENSO and IOD in different basins is time-varying and related to the Atlantic Multidecadal Oscillation (AMO), with a weakened relationship during AMO warm phases. Atlantic pacemaker simulations successfully reproduce the decadal fluctuations in the ENSO-IOD relationship and its connection to the AMO. The warm sea surface temperature (SST) anomalies associated with the AMO drive climate changes in the Indo-Pacific region, including cooling of the central Pacific and deepening of the thermocline in the eastern Indian Ocean, which decouples the IOD from ENSO by modulating ocean-atmosphere feedback.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Florian Boergel, H. E. Markus Meier, Matthias Groeger, Monika Rhein, Cyril Dutheil, Jan Moritz Kaiser
Summary: This study analyzes the impact of temperature variations in the North Atlantic on regional climate and identifies two different clusters of physical mechanisms in CMIP6 models. The first cluster shows a coherent relationship between the North Atlantic Oscillation (NAO) and the Atlantic Multidecadal Variability (AMV), resulting in decreased precipitation in Northern Europe. In contrast, the second cluster does not show significant coherence between NAO and AMV, but it leads to a low-pressure anomaly in the subpolar gyre and increased precipitation in Europe.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Yanfeng Wang, Ping Huang
Summary: Fire emissions in South America consistently decreased from 2003 to 2019, which can be attributed to unfavorable climatic conditions and the phase transition of the Atlantic Multidecadal Oscillation. Despite anthropogenic forcing exacerbating drought and fire risks, fire emissions and aerosol pollution in the southern Amazon and Pantanal region showed a consistent long-term decrease. This decrease is linked to climatic conditions that hindered fire intensification and spread, including increased humidity and slower surface wind speed.
NATURE COMMUNICATIONS
(2022)
