Items where Author is "Johnstone, Heather J H"

Liebrand, D, Wade, BS, Beddow, HM, King, DJ, Harrison, AD, Johnstone, HJH, Drury, AJ, Pälike, H, Sluijs, A and Lourens, LJ (2024) Oceanography of the Eastern Equatorial Pacific Ocean Across the Oligocene‐Miocene Transition. Paleoceanography and Paleoclimatology, 39(7). doi:10.1029/2024PA004892

Nascimento, RA, Johnstone, HJH, Kuhnert, H, Santos, TP, Venancio, IM, Chiessi, CM, Ballalai, JM, Campos, MC, Govin, A, Mulitza, S and Albuquerque, ALS (2023) Long-term variability of the western tropical Atlantic sea surface temperature driven by greenhouse gases and AMOC. Quaternary Science Reviews, 322. 108431. doi:10.1016/j.quascirev.2023.108431

Liebrand, D, de Bakker, ATM, Johnstone, HJH and Miller, CS (2023) Disparate energy sources for slow and fast Dansgaard–Oeschger cycles. Climate of the Past, 19(7). 1447-1459. doi:10.5194/cp-19-1447-2023

Barragán‐Montilla, S, Mulitza, S, Johnstone, HJH and Pälike, H (2023) Stagnant North Atlantic deep water heat uptake with reduced Atlantic meridional overturning circulation during the last deglaciation. Paleoceanography and Paleoclimatology, 38(6). doi:10.1029/2022PA004575

Nascimento, RA, Shimizu, MH, Venancio, IM, Chiessi, CM, Kuhnert, H, Johnstone, HJH, Govin, A, Lessa, D, Ballalai, JM, Santos, TP, Piacsek, P, Mulitza, S and Albuquerque, ALS (2022) Warmer western tropical South Atlantic during the Last Interglacial relative to the current interglacial period. Global and Planetary Change, 215. 103889. doi:10.1016/j.gloplacha.2022.103889

Mulitza, S, Bickert, T, Bostock, HC, Chiessi, CM, Donner, B, Govin, A, Harada, N, Huang, E, Johnstone, HJH, Kuhnert, H, Langner, M, Lamy, F, Lembke-Jene, L, Lisiecki, LE, Lynch-Stieglitz, J, Max, L, Mohtadi, M, Mollenhauer, G, Muglia, J, Nürnberg, D, Paul, A, Rühlemann, C, Repschläger, J, Saraswat, R, Schmittner, A, Sikes, EL, Spielhagen, RF and Tiedemann, R (2022) World atlas of late quaternary foraminiferal oxygen and carbon isotope ratios. Earth System Science Data, 14(6). 2553-2611. doi:10.5194/essd-14-2553-2022

Johnstone, HJH, Kuhnert, H, Bickert, T, Romero, O and Pälike, H (2020) Single tests of hermocline dwelling foraminifera Globorotalia inflata as recorder of upper water column structure off Mauritania (NW Africa): methodology and paleoceanographic use. Paleoceanography and Paleoclimatology, 35(8). doi:10.1029/2019PA003844

Ballalai, JM, Santos, TP, Lessa, DO, Venancio, IM, Chiessi, CM, Johnstone, HJH, Kuhnert, H, Claudio, MR, Toledo, F, Costa, KB and Albuquerque, ALS (2019) Tracking spread of the Agulhas Leakage into the western South Atlantic and its northward transmission during the Last Interglacial. Paleoceanography and Paleoclimatology. doi:10.1029/2019PA003653

Johnstone, HJH, Steinke, S, Kuhnert, H, Bickert, T, Pälike, H and Mohtadi, M (2016) Automated cleaning of foraminifera shells before Mg/Ca analysis using a pipette robot. Geochemistry, Geophysics, Geosystems, 17(8). 3502-3511. doi:10.1002/2016GC006422

Johnstone, HJH, Lee, W and Schulz, M (2016) Effect of preservation state of planktonic foraminifera tests on the decrease in Mg/Ca due to reductive cleaning and on sample loss during cleaning. Chemical Geology, 420. 23-36. doi:10.1016/j.chemgeo.2015.10.045

Johnstone, HJH, Kiefer, T, Elderfield, H and Schulz, M (2014) Calcite saturation, foraminiferal test mass, and Mg/Ca-based temperatures dissolution corrected using XDX-A 150 ka record from the western Indian Ocean. Geochemistry, Geophysics, Geosystems, 15(3). 781-797. doi:10.1002/2013GC004994

Zarriess, M, Johnstone, HJH, Prange, M, Steph, S, Groeneveld, J, Mulitza, S and Mackensen, A (2011) Bipolar seesaw in the northeastern tropical Atlantic during Heinrich stadials. Geophysical Research Letters, 38. L04706. doi:10.1029/2010GL046070

Johnstone, HJH, Yu, J, Elderfield, H and Schulz, M (2011) Improving temperature estimates derived from Mg/Ca of planktonic foraminifera using X-ray computed tomography-based dissolution index, XDX. Paleoceanography, 26. PA1215. doi:10.1029/2009PA001902

Johnstone, HJH (2010) Assessing dissolution in the tests of planktonic foraminifera using computed tomography (CT): potential for improving paleoceanographic reconstructions. PhD thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany. urn:nbn:de:gbv:46-00101815-15

Steinke, S, Groeneveld, J, Johnstone, HJH and Rendle-Bühring, R (2010) East Asian summer monsoon weakening after 7.5 Ma: Evidence from combined planktonic foraminifera Mg/Ca and delta 0-18 (ODP Site 1146; northern South China Sea). Palaeogeography, Palaeoclimatology, Palaeoecology, 289(1-4). 33-43. doi:10.1016/j.palaeo.2010.02.007

Johnstone, HJH, Schulz, M, Barker, S and Elderfield, H (2010) Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera. Marine Micropaleontology, 77(1-2). 58-70. doi:10.1016/j.marmicro.2010.07.004