Joseph Henry Lacasce

• Gjermundsen, Ada; Lacasce, Joseph Henry & Denstad, Liv (2018). The thermally-driven ocean circulation with realistic bathymetry. Journal of Physical Oceanography.  ISSN 0022-3670.  48(3), s 647- 665 . doi: 10.1175/JPO-D-17-0147.1 Full text in Research Archive.
• Gjermundsen, Ada & Lacasce, Joseph Henry (2017). Comparing the linear and nonlinear buoyancy-driven circulation. Tellus. Series A, Dynamic meteorology and oceanography.  ISSN 0280-6495.  69(1) . doi: 10.1080/16000870.2017.1299282 Full text in Research Archive.
• Lacasce, Joseph Henry (2017). The Prevalence of oceanic surface modes. Geophysical Research Letters.  ISSN 0094-8276.  44(21), s 11,097- 11,105 . doi: 10.1002/2017GL075430 Full text in Research Archive.
• Balwada, Dhruv; Lacasce, Joseph Henry & Speer, Kevin (2016). Scale-dependent distribution of kinetic energy from surface drifters in the Gulf of Mexico. Geophysical Research Letters.  ISSN 0094-8276.  43(20), s 10,856- 10,863 . doi: 10.1002/2016GL069405
• Balwada, Dhruv; Speer, Kevin G.; Lacasce, Joseph Henry; Owens, W. Brechner; Marshall, John & Ferrari, Raffaele (2016). Circulation and stirring in the Southeast Pacific Ocean and the Scotia sea sectors of the Antarctic Circumpolar Current. Journal of Physical Oceanography.  ISSN 0022-3670.  46(7), s 2005- 2027 . doi: 10.1175/JPO-D-15-0207.1
• Beron-Vera, Francisco J & Lacasce, Joseph Henry (2016). Statistics of simulated and observed pair separations in the Gulf of Mexico. Journal of Physical Oceanography.  ISSN 0022-3670.  46(7), s 2183- 2199 . doi: 10.1175/JPO-D-15-0127.1
• de La Lama, Marta; Lacasce, Joseph Henry & Fuhr, Helle Kristine (2016). The vertical structure of ocean eddies. Dynamics and Statistics of the Climate System.  ISSN 2059-6987.  1(1), s 1- 16 . doi: /10.1093/climsys/dzw001
• Lacasce, Joseph Henry (2016). Estimating Eulerian energy spectra from drifters. Fluids.  ISSN 2311-5521.  1(4) . doi: 10.3390/fluids1040033
• Graff, Lise Seland; Guttu, Sigmund & Lacasce, Joseph Henry (2015). Relative dispersion in the atmosphere from reanalysis winds. Journal of the Atmospheric Sciences.  ISSN 0022-4928.  72(7), s 2769- 2785 . doi: 10.1175/JAS-D-14-0225.1
• Lacasce, Joseph Henry & Wang, J. (2015). Estimating subsurface velocities from surface fields with idealized stratification. Journal of Physical Oceanography.  ISSN 0022-3670.  45(9), s 2424- 2435 . doi: 10.1175/JPO-D-14-0206.1
• Gjermundsen, Ada; Lacasce, Joseph Henry & Graff, Lise Seland (2014). The atmospheric response to surface heating under maximum entropy production. Journal of the Atmospheric Sciences.  ISSN 0022-4928.  71(6), s 2204- 2220 . doi: 10.1175/JAS-D-13-0181.1 Full text in Research Archive.
• Graff, Lise Seland & Lacasce, Joseph Henry (2014). Changes in cyclone characteristics in response to modified SSTs. Journal of Climate.  ISSN 0894-8755.  27(11), s 4273- 4295 . doi: 10.1175/JCLI-D-13-00353.1
• Lacasce, Joseph Henry; Ferrari, Raffaele; Marshall, John; Tulloch, Ross; Balwada, D. & Speer, Kevin (2014). Float-derived isopycnal diffusivities in the DIMES experiment. Journal of Physical Oceanography.  ISSN 0022-3670.  44(2), s 764- 780 . doi: 10.1175/JPO-D-13-0175.1
• Tulloch, Ross; Ferrari, Raffaele; Jahn, Oliver; Klocker, Andreas; Lacasce, Joseph Henry; Ledwell, James R.; Marshall, John; Messias, Marie-Jose; Speer, Kevin & Watson, Andrew (2014). Direct estimate of lateral eddy diffusivity upstream of drake passage. Journal of Physical Oceanography.  ISSN 0022-3670.  44(10), s 2593- 2616 . doi: 10.1175/JPO-D-13-0120.1
• Ghaffari, Peygham; Isachsen, Pål Erik & Lacasce, Joseph Henry (2013). Topographic effects on current variability in the Caspian Sea. Journal of Geophysical Research - Oceans.  ISSN 2169-9275.  118(12), s 7107- 7116 . doi: 10.1002/2013JC009128
• Høydalsvik, Frode; Mauritzen, Cecilie; Orvik, Kjell Arild; Lacasce, Joseph Henry; Lee, Craig M. & Gobat, Jason (2013). Transport estimates of the Western Branch of the Norwegian Atlantic Current from glider surveys. Deep Sea Research Part I: Oceanographic Research Papers.  ISSN 0967-0637.  79, s 86- 95 . doi: 10.1016/j.dsr.2013.05.005
• Koszalka, I.; Lacasce, Joseph Henry & Mauritzen, Cecilie (2013). In pursuit of anomalies-Analyzing the poleward transport of Atlantic Water with surface drifters. Deep-sea research. Part II, Topical studies in oceanography.  ISSN 0967-0645.  85, s 96- 108 . doi: 10.1016/j.dsr2.2012.07.035
• Wang, Jinbo; Flierl, Glenn R.; Lacasce, Joseph Henry; McClean, Julie & Mahadevan, Amala (2013). Reconstructing the Ocean's Interior from Surface Data. Journal of Physical Oceanography.  ISSN 0022-3670.  43(8), s 1611- 1626 . doi: 10.1175/JPO-D-12-0204.1
• Graff, Lise Seland & Lacasce, Joseph Henry (2012). Changes in the Extratropical Storm Tracks in Response to Changes in SST in an AGCM. Journal of Climate.  ISSN 0894-8755.  25(6), s 1854- 1870 . doi: 10.1175/JCLI-D-11-00174.1
• Isachsen, Pål Erik; Koszalka, I. & Lacasce, Joseph Henry (2012). Observed and modeled surface eddy heat fluxes in the eastern Nordic Seas. Journal of Geophysical Research - Oceans.  ISSN 2169-9275.  117(C8) . doi: 10.1029/2012JC007935
• Isaksen, Ivar S A; Zerefos, C; Wang, W-C; Balis, D.; Eleftheratos, K.; Rognerud, Bjørg; Stordal, Frode; Berntsen, Terje Koren; Lacasce, Joseph Henry; Søvde, Ole Amund; Oliviè, Dirk Jan Leo; Orsolini, Yvan; Zyrichidou, I.; Prather, M.J. & Tuinder, O. N. E. (2012). Attribution of the Arctic ozone column deficit in March 2011. Geophysical Research Letters.  ISSN 0094-8276.  39(L24810) . doi: 10.1029/2012GL053876 Show summary

  Arctic column ozone reached record low values (∼310 DU) during March of 2011, exposing Arctic ecosystems to enhanced UV-B. We identify the cause of this anomaly using the Oslo CTM2 atmospheric chemistry model driven by ECMWF meteorology to simulate Arctic ozone from 1998 through 2011. CTM2 successfully reproduces the variability in column ozone, from week to week, and from year to year, correctly identifying 2011 as an extreme anomaly over the period. By comparing parallel model simulations, one with all Arctic ozone chemistry turned off on January 1, we find that chemical ozone loss in 2011 is enhanced relative to previous years, but it accounted for only 23% of the anomaly. Weakened transport of ozone from middle latitudes, concurrent with an anomalously strong polar vortex, was the primary cause of the low ozone When the zonal winds relaxed in mid-March 2011, Arctic column ozone quickly recovered.

• Klocker, Andreas; Ferrari, Raffaele & Lacasce, Joseph Henry (2012). Estimating Suppression of Eddy Mixing by Mean Flows. Journal of Physical Oceanography.  ISSN 0022-3670.  42(9), s 1566- 1576 . doi: 10.1175/JPO-D-11-0205.1
• Koszalka, Inga; Lacasce, Joseph Henry & Mauritzen, Cecilie (2012). In pursuit of anomalies - Analyzing the poleward transport of Atlantic Water with surface drifters. Deep-sea research. Part II, Topical studies in oceanography.  ISSN 0967-0645. . doi: 10.1016/j.dsr2.2012.07.035
• Lacasce, Joseph Henry (2012). Surface Quasigeostrophic Solutions and Baroclinic Modes with Exponential Stratification. Journal of Physical Oceanography.  ISSN 0022-3670.  42(4), s 569- 580 . doi: 10.1175/JPO-D-11-0111.1
• Melsom, Arne; Counillon, Francois; Lacasce, Joseph Henry & Bertino, Laurent (2012). Forecasting search areas using ensemble ocean circulation modeling. Ocean Dynamics.  ISSN 1616-7341.  62(8), s 1245- 1257 . doi: 10.1007/s10236-012-0561-5 Show summary

  We investigate trajectory forecasting as an application of ocean circulation ensemble modeling. The ensemble simulations are performed weekly, starting with assimilation of data for various variables from multiple sensors on a range of observational platforms. The ensemble is constructed from 100 members, and member no. 1 is designed as a standard (deterministic) simulation, providing us with a benchmark for the study. We demonstrate the value of the ensemble approach by validating simulated trajectories using data from ocean surface drifting buoys. We find that the ensemble average trajectories are generally closer to the observed trajectories than the corresponding results from a deterministic forecast. We also investigate an alternative model in which velocity perturbations are added to the deterministic results and ensemble mean results, by a first-order stochastic process. The parameters of the stochastic model are tuned to match the dispersion of the ensemble approach. Search areas from the stochastic model give a higher hit ratio of the observations than the results based on the ensemble. However, we find that this is a consequence of a positive skew of the area distribution of the convex hulls of the ensemble trajectory end points.

• O'Reilly, Christopher H; Czaja, Arnaud & Lacasce, Joseph Henry (2012). The emergence of zonal ocean jets under large-scale stochastic wind forcing. Geophysical Research Letters.  ISSN 0094-8276.  39 . doi: 10.1029/2012GL051684
• Ohlmann, J. Carter; Lacasce, Joseph Henry; Washburn, Libe; Mariano, Arthur J. & Emery, Brian (2012). Relative dispersion observations and trajectory modeling in the Santa Barbara Channel. Journal of Geophysical Research - Oceans.  ISSN 2169-9275.  117 . doi: 10.1029/2011JC007810
• Andersson, Maria Helena; Orvik, Kjell Arild; Lacasce, Joseph Henry; Koszalka, Inga & Mauritzen, Cecilie (2011). Variability of the Norwegian Atlantic Current and associated eddy field from surface drifters. Journal of Geophysical Research - Oceans.  ISSN 2169-9275.  116 . doi: 10.1029/2011JC007078
• Koszalka, Inga; Lacasce, Joseph Henry; Andersson, Maria Helena; Orvik, Kjell Arild & Mauritzen, Cecilie (2011). Surface circulation in the Nordic Seas from clustered drifters. Deep Sea Research Part I: Oceanographic Research Papers.  ISSN 0967-0637.  58(4), s 468- 485 . doi: 10.1016/j.dsr.2011.01.007
• Mauritzen, Cecilie; Hansen, Edmond; Andersson, Maria Helena; Berx, Barbara; Beszczynska-Möller, Agnieszka; Burud, Ingunn; Christensen, Kai Håkon; Debernard, Jens; Steur, Laura de; Dodd, Paul; Gerland, Sebastian; Godøy, Øystein Arne; Hansen, Bogi; Hudson, Stephen; Høydalsvik, Frode; Ingvaldsen, Randi; Isachsen, Pål Erik; Kasajima, Yoshie; Koszalka, Inga; Kovacs, Kit; Køltzow, Morten Ø.; Lacasce, Joseph Henry; Lee, Craig M.; Lavergne, Thomas; Lydersen, Christian; Nicolaus, Marcel; Nilsen, Frank; Nøst, Ole Andres; Orvik, Kjell Arild; Reigstad, Marit; Schyberg, Harald; Seuthe, Lena; Skagseth, Øystein; Skardhamar, Jofrid; Skogseth, Ragnheid; Sperrevik, Ann; Svensen, Camilla; Søiland, Henrik; Teigen, Sigurd Henrik; Tverberg, Vigdis & Wexels Riser, Christian (2011). Closing the loop - Approaches to monitoring the state of the Arctic Mediterranean during the International Polar Year 2007-2008. Progress in Oceanography.  ISSN 0079-6611.  90(1-4), s 62- 89 . doi: 10.1016/j.pocean.2011.02.010
• Griesel, Alexa; Gille, Sarah; Sprintall, Janet; McClean, Julie; Lacasce, Joseph Henry & Maltrud, Matt (2010). Isopycnal diffusivities in the Antarctic Circumpolar Current inferred from Lagrangian floats in an eddying model. Journal of Geophysical Research - Oceans.  ISSN 2169-9275.  115(C06006) . doi: 10.1029/2009JC005821
• Koszalka, Inga & Lacasce, Joseph Henry (2010). Lagrangian analysis by clustering. Ocean Dynamics.  ISSN 1616-7341.  60(4), s 957- 972 . doi: 10.1007/s10236-010-0306-2
• Lacasce, Joseph Henry (2010). Relative displacement probability distribution functions from balloons and drifters. Journal of Marine Research.  ISSN 0022-2402.  68(3-4), s 433- 457
• Lacasce, Joseph Henry & Isachsen, Pål Erik (2010). The linear models of the ACC. Progress in Oceanography.  ISSN 0079-6611.  84(3-4), s 139- 157 . doi: 10.1016/j.pocean.2009.11.002
• Koszalka, Inga; Lacasce, Joseph Henry & Orvik, Kjell Arild (2009). Relative dispersion in the Nordic Seas. Journal of Marine Research.  ISSN 0022-2402.  67(4), s 411- 433 . doi: 10.1357/002224009790741102
• Lacasce, Joseph Henry (2008). Statistics from Lagrangian observations. Progress in Oceanography.  ISSN 0079-6611.  77, s 1- 29 . doi: 10.1016/j.pocean.2008.02.002
• Lacasce, Joseph Henry (2008). The vortex merger rate in freely decaying, two-dimensional turbulence. Physics of fluids.  ISSN 1070-6631.  20 . doi: 10.1063/1.2957020
• Lacasce, Joseph Henry; Nøst, O.A. & Isachsen, Pål Erik (2008). The asymmetry of free circulations in closed ocean gyres. Journal of Physical Oceanography.  ISSN 0022-3670.  38(2), s 517- 526 . doi: 10.1175/2007JPO3789.1
• Isachsen, Pål Erik; Lacasce, Joseph Henry & Pedlosky, Joseph (2007). Rossby wave instability and apparent phase speeds in large ocean basins. Journal of Physical Oceanography.  ISSN 0022-3670.  37, s 1177- 1191 . doi: 10.1175/JPO3054.1
• Lacasce, Joseph Henry & Isachsen, Pål Erik (2007). On Sverdrup discontinuities and vortices in the Southwest Indian Ocean. Journal of Physical Oceanography.  ISSN 0022-3670.  37, s 2940- 2950
• Lacasce, Joseph Henry & Mahadevan, A. (2006). Estimating sub-surface horizontal and vertical velocities from sea surface temperature. Journal of Marine Research.  ISSN 0022-2402.  64(5), s 695- 721
• Lacasce, Joseph Henry (2005). On the Eulerian and Lagrangian velocity distributions in the North Atlantic. Journal of Physical Oceanography.  ISSN 0022-3670.  35(12), s 2327- 2336 Show summary

  Velocity probability density functions (PDFs) are calculated using data from subsurface current meters in the western North Atlantic Ocean. The PDFs are weakly, but significantly, non-Gaussian. They deviate from normality because of an excess of energetic events, and there are evidently more such events in the main thermocline than in the deep ocean. The PDFs are also compared with those obtained from subsurface floats in the same region. The PDFs are statistically indistinguishable so long as the float data are averaged in appropriately sized bins. Taking too-small bins yields overly Gaussian float PDFs, and taking too-large bins yields too-non-Gaussian PDFs. With this caveat, the Lagrangian and Eulerian PDFs agree, consistent with expectations from theory and previous numerical simulations.

• Lacasce, Joseph Henry (2005). Statistics of low frequency currents over the western Nordic shelf and slope; part I, current meters. Ocean Dynamics.  ISSN 1616-7341.  55(3-4), s 213- 221
• Lacasce, Joseph Henry & Engedahl, Harald (2005). Statistics of low frequency currents over the western Nordic shelf and slope; part II, model. Ocean Dynamics.  ISSN 1616-7341.  55(3-4), s 222- 237
• Lacasce, Joseph Henry (2004). Diffusivity and viscosity dependence in the linear thermocline. Journal of Marine Research.  ISSN 0022-2402.  62, s 743- 769
• Lacasce, Joseph Henry & Nycander, Jonas (2004). Stable and unstable vortices attached to seamounts. Journal of Fluid Mechanics.  ISSN 0022-1120.  507, s 71- 94
• Lacasce, Joseph Henry & Pedlosky, Joseph (2004). The instability of Rossby basin modes and the oceanic eddy field. Journal of Physical Oceanography.  ISSN 0022-3670.  34, s 2027- 2041
• Lacasce, Joseph Henry & Ohlmann, Carter (2003). Relative dispersion at the surface of the Gulf of Mexico. Journal of Marine Research.  ISSN 0022-2402.  61, s 285- 312
• Lacasce, Joseph Henry (2003). Wind-forced barotropic flow in sub-polar regions. Journal of Physical Oceanography.  ISSN 0022-3670.  33(12), s 2534- 2550
• Lacasce, Joseph Henry (2002). On turbulence and normal modes in a basin. Journal of Marine Research.  ISSN 0022-2402.  60, s 431- 460
• Lacasce, Joseph Henry & Pedlosky, Joseph (2002). Baroclinic Rossby waves in irregular basins. Journal of Physical Oceanography.  ISSN 0022-3670.  32, s 2828- 2847
• Lacasce, Joseph Henry (2000). Baroclinic Rossby waves in a square basin. Journal of Physical Oceanography.  ISSN 0022-3670.  30, s 3161- 3178
• Lacasce, Joseph Henry (2000). Floats and f/H. Journal of Marine Research.  ISSN 0022-2402.  58, s 61- 95
• Lacasce, Joseph Henry (2000). Relative dispersion in the subsurface North Atlantic. Journal of Marine Research.  ISSN 0022-2402.  58, s 863- 894
• Lacasce, Joseph Henry & Brink, Kenneth (2000). Geostrophic turbulence over a slope. Journal of Physical Oceanography.  ISSN 0022-3670.  30, s 1305- 1324
• Lacasce, Joseph Henry & Speer, Kevin (1999). Lagrangian statistics in unforced barotropic flows. Journal of Marine Research.  ISSN 0022-2402.  57, s 245- 274
• Lacasce, Joseph Henry (1998). A geostrophic vortex on a slope. Journal of Physical Oceanography.  ISSN 0022-3670.  28, s 2362- 2381

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• Dugstad, Johannes Sandang; Lacasce, Joseph Henry; Koszalka, Inga & Fer, Ilker (2017). Observing mass exchange with the Lofoten Basin using surface drifters.
• Gaina, Carmen & Lacasce, Joseph Henry (2014). Linking the Tectonic Evolution of the Northeast Atlantic and the Arctic: Paleobathymetry Reconstructions and Paleoceanographic Implications.
• Lacasce, Joseph Henry (2010). The Jet Stream, high and low pressure systems and fronts; Understanding the weather.
• Lacasce, Joseph Henry (2009). Relative dispersion in the Nordic Seas.
• Lacasce, Joseph Henry (2009). Relative dispersion in the Nordic Seas.
• Lacasce, Joseph Henry (2009). Relative dispersion in the Nordic Seas.
• Lacasce, Joseph Henry (2009). Relative dispersion in the Nordic Seas.
• Lacasce, Joseph Henry (2009). Relative dispersion in the atmosphere and ocean.
• Lacasce, Joseph Henry (2009). Turbulent dispersion in the Nordic Seas.
• Lacasce, Joseph Henry (2008). The linear models of the ACC.
• Lacasce, Joseph Henry (2008). The vortex merger rate in 2-D turbulence.
• Lacasce, Joseph Henry (2008). The vortex merger rate in freely-decaying, 2D tubulence.
• Lacasce, Joseph Henry (2007). The vortex merger rate in freely-decaying 2-D turbulence.
• Lacasce, Joseph Henry; Albretsen, Jon & Røed, Lars Petter (2006). Ocean temperatures at Ekofisk. met.no note. 9/2006.

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