McCall Glacier record of Arctic climate change: Interpreting a northern Alaska ice core with regional water isotopes

Klein, E. S.; Nolan, M.; McConnell, Joseph R.; Sigl, Michael; Cherry, J. E.; Young, J. M.; Welker, Jeffrey M.

doi:10.1016/j.quascirev.2015.07.030

Cited by 36 publications

(47 citation statements)

References 48 publications

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“…If δ 18 O prcp values are actually controlled by a different environmental factor in the ECUS, then supplementing the current δ 18 O prcp ‐PDt database with additional climatological data in the future may allow us to identify the factor. The most promising candidates for δ 18 O prcp control in the ECUS derive from studies into the effects of atmospheric circulation [ Liu et al ., ; Klein et al ., ], condensation height [ Buenning et al ., ], and stratiform versus convective precipitation fractions [ Aggarwal et al ., ], while other candidates such as moisture source changes appear less likely [ Akers , ]. Intensive examination of the relationships between these factors and δ 18 O prcp variability is needed at multiple temporal scales to clarify which relationship is maintained through both short‐term and long‐term aggregations and groupings.…”

Section: Discussionmentioning

confidence: 99%

“…Much recent research has focused on unifying and reconciling modeled δ 18 O values with real‐world measurements [e.g., Kendall and Coplen , ; Dutton et al ., ; Bowen et al ., ; Vachon et al ., ]. This data‐model unification is necessary to improve global circulation models and accurately interpret δ 18 O variations in paleoclimate records [ Alley and Cuffey , ; Bowen , ; Lambert and Aharon , ; Klein et al ., ].…”

Section: Introductionmentioning

confidence: 99%

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Reassessing the role of temperature in precipitation oxygen isotopes across the eastern and central United States through weekly precipitation‐day data

Akers

Welker

Brook

2017

Water Resources Research

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Air temperature is correlated with precipitation oxygen isotope (δ18Oprcp) variability for much of the eastern and central United States, but the nature of this δ18Oprcp‐temperature relationship is largely based on data coarsely aggregated at a monthly resolution. We constructed a database of 6177 weeks of isotope and precipitation‐day air temperature data from 25 sites to determine how more precise data change our understanding of this classic relationship. Because the δ18Oprcp‐temperature relationship is not perfectly linear, trends in the regression residuals suggest the influence of additional environmental factors such as moisture recycling and extratropical cyclone interactions. Additionally, the temporal relationships between δ18Oprcp and temperature observed in the weekly data at individual sites can explain broader spatial patterns observed across the study region. For 20 of 25 sites, the δ18Oprcp‐temperature relationship slope is higher for colder precipitation than for warmer precipitation. Accordingly, northern and western sites with relatively more cold precipitation events have steeper overall relationships with higher slope values than southeastern sites that have more warm precipitation events. Although the magnitude of δ18Oprcp variability increases to the north and west, the fraction of δ18Oprcp variability explained by temperature increases due to wider annual temperature ranges, producing stronger relationships in these regions. When our δ18Oprcp‐temperature data are grouped by month, we observe significant variations in the relationship from month to month. This argues against a principal causative role for temperature and suggests the existence of an alternative environmental control on δ18Oprcp values that simply covaries seasonally with temperature.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reassessing the role of temperature in precipitation oxygen isotopes across the eastern and central United States through weekly precipitation‐day data

Akers

Welker

Brook

2017

Water Resources Research

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“…Lately, more attention has been paid to d ‐excess changes in a wide variety of paleoclimatic archives, such as ice cores (Klein et al, ), speleothems (Demény et al, ), and lake sediments (Hepp et al, ) in order to reconstruct source precipitation conditions coupled with subsequent analysis of potential air mass back trajectories (Pfahl & Wernli, ; Risi, Landais, Winkler, & Vimeux, ). Jouzel et al () explained that d ‐excess values may deviate from +10 (‰) due to the combination of three factors: a) a relative humidity (RH) increase in the precipitation source, b) a decrease in sea surface temperature (SST), and c) greater wind speeds (>7 ms ‐1 ) affecting the evaporation regime and subsequent kinetic fractionation.…”

Section: Introductionmentioning

confidence: 99%

Tropical precipitation anomalies and d -excess evolution during El Niño 2014-16

et al. 2016

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The last 2014-16 El Niño event was among the three strongest episodes on record. El Niño considerably changes annual and seasonal precipitation across the tropics. Here, we present a unique stable isotope data set of daily precipitation collected in Costa Rica prior to, during, and after El Niño 2014-16, in combination with Lagrangian moisture source and precipitation anomaly diagnostics. δ 2 H composition ranged from -129.4 to +18.1 (‰) while δ 18 O ranged from -17.3 to +1.0 (‰). No significant difference was observed among δ 18 O (P=0.186) and δ 2 H (P=0.664) mean annual compositions. However, mean annual d-excess showed a significant decreasing trend (from +13.3 to +8.7 ‰) (P<0.001) with values ranging from +26.6 to -13.9 ‰ prior to and during the El Niño evolution. The latter decrease in d-excess can be partly explained by an enhanced moisture flux convergence across the southeastern Caribbean Sea coupled with moisture transport from northern South America by means of an increased Caribbean Low Level Jet regime. During 2014-15, precipitation deficit across the Pacific domain averaged 46% resulting in a very severe drought; while a 94% precipitation surplus was observed in the Caribbean domain. Understanding these regional moisture transport mechanisms during a strong El Niño event may contribute to a) better understanding of precipitation anomalies in the tropics and b) re-evaluate past stable isotope interpretations of ENSO events in paleoclimatic archives within the Central America region.

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“…Therefore, reduced sea ice extent driven by rapid Arctic warming [Cavalieri and Parkinson, 2012;Parkinson and Comiso, 2013] has important hydroclimatic implications. Recent decreases in Arctic sea ice extent are likely leading to more Arctic sourced precipitation [Bintanja and Selten, 2014;Kim et al, 2014;Klein et al, 2016;Kopec et al, 2015;Puntsag et al, 2016]. Water isotope ratios (δ 18 O, δ 2 H, and deuterium excess) are important tools to help understand these Arctic hydroclimate changes [Klein et al, 2015;Steen-Larsen et al, 2013].…”

Section: Introductionmentioning

confidence: 99%

Influence of sea ice on ocean water vapor isotopes and Greenland ice core records

Klein

Welker

2016

Geophysical Research Letters

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A warming climate results in sea ice loss and impacts to the Arctic water cycle. The water isotope parameter deuterium excess, a moisture source proxy, can serve as a tracer to help understand hydrological changes due to sea ice loss. However, unlocking the sea ice change signal of isotopes from ice cores requires understanding how sea ice changes impact deuterium excess, which is unknown. Here we present the first isotope data linking a gradient of sea ice extents to oceanic water vapor deuterium excess values. Initial loss of sea ice extent leads to lower deuterium excess moisture sources, and then values progressively increase with further ice loss. Our new process‐based interpretation suggests that past rapid (1–3 years) Greenland ice core changes in deuterium excess during warming might not be the result of abrupt atmospheric circulation shifts, but rather gradual loss of sea ice extent at northern latitude moisture sources.

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McCall Glacier record of Arctic climate change: Interpreting a northern Alaska ice core with regional water isotopes

Cited by 36 publications

References 48 publications

Reassessing the role of temperature in precipitation oxygen isotopes across the eastern and central United States through weekly precipitation‐day data

Reassessing the role of temperature in precipitation oxygen isotopes across the eastern and central United States through weekly precipitation‐day data

Tropical precipitation anomalies and d -excess evolution during El Niño 2014-16

Influence of sea ice on ocean water vapor isotopes and Greenland ice core records

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