Senior Lecturer at the Institute of Earth Sciences, the Hebrew university of Jerusalem, Israel (CV).
Married to Gili, and father to Shir, Libi, Ron, and Alon.
Climate dynamics. Google Scholar profile.
Music that rocks. Mountain biking. MMA. BJJ.
What is the role of Global Warming in the recent widening of the tropical circulation?
The mean tropical circulation has widened in recent decades, affecting vast populations inhabiting the boundaries of the arid subtropical belts. An analysis of the sensitivity of the tropical circulation to variations in sea surface temperatures elucidates the relative contributions of global warming and natural variability to recent and past changes in the extent of the tropical circulation. The methodology we developed provides a basis for comparing the predictions of climate models and theory with observations.
Tropical hydrological cycle
I am interested in questions such as:
- What determines the zonal structure of the intertropical convergence zone (ITCZ)?
- How do monsoons vary with climate?
- Can we explain the reconstructed tropical precipitation distributions of past climates (e.g., Mid Holocene and LGM)?
- What is the role of ocean-atmosphere coupling in the seasonal and interannual variability of the ITCZ and Monsoons?
- What controls the onset, retreat, and intensity of Monsoons?
The animation below demonstrates some of the complexity of the tropical hydrological cycle.
Animation: the daily climatology of Precipitation minus Evaporation (P-E) and surface winds. The right panel shows the zonal mean of P-E (black), surface insolation (incoming short wave radiation at the surface – brown) and surface temperature (blue). Values over land and ocean are shown as dashed and solid lines, respectively. For visual clarity, P-E on the right panel is shown in units of mm/day but temperature and insolation are shown as scaled deviations from annual mean. Data taken from the ERA-Interim reanalysis.
The diversity of geophysical datasets and the lack of a generally accepted data-archiving standard complicates the management and analysis of geophysical data. Geophysical data analysis often involves numerous technical annoyances, resulting in a great deal of time being wasted on learning the intricacies of particular datasets, redundant data conversions, interpolations, code adaptations, and the like.
GOAT (Geophysical Observational Analysis Tool) is a free MATLAB tool I wrote. It provides a uniform archiving standard for all geophysical data, thereby enabling the use of generic code that can be applied to any dataset. GOAT is designed to simplify the access to geophysical data, providing generic data management, retrieval, visualization and analysis tools for all geophysical datasets. GOAT integrates with online OPeNDAP sources and NetCDF archives as well as *.mat files. It can also be used to access or download various data. GOAT can be applied to observations, reanalyses, and climate-model outputs.
A graphic user interface allows performing routine tasks such as creating temporal and spatial subsets, applying temporal and spatial filters, and plotting. All GUI operations can be easily converted into scripts.
See more at goat-geo.org
Adam O., T. Bischoff, and T. Schneider, 2016: Seasonal and interannual variations of the energy flux equator and ITCZ. Part II: Zonally varying shifts of the ITCZ. Journal of Climate, 0,doi:10.1175/JCLI-D-15-0710.1. pdf.
Adam O., T. Schneider, F. Brient, and T. Bischoff, 2016: Relation of the double-ITCZ bias to the atmospheric energy budget in climate models. Geophys. Res. Lett., 43, 7670-7677. pdf.
Adam O., T. Bischoff, and T. Schneider, 2016: Seasonal and interannual variations of the energy flux equator and ITCZ. Part I: Zonally averaged ITCZ position. Journal of Climate, 29, 3219-3230. pdf.
Adam O., T. Schneider and N. Harnik, 2014: Role of changes in mean temperatures vs. temperature gradients in the recent widening of the Hadley circulation. J. Climate, 27, 7450–7461. pdf.
Harnik N., E. Galanti, O. Martius and O. Adam, 2014: The anomalous merging of the African and North Atlantic jet streams during Northern Hemisphere winter of 2010. J. Climate, 27, 7319–7334. pdf.
Adam O., and N. Harnik, 2012: Idealized annually averaged Hadley Circulation in a Shallow Water Model. J. Atmos. Sci. 70, 284-302. pdf.
Adam O., and N. Paldor, 2010b: On the role of viscosity in ideal Hadley circulation models. Geophys. Res. Lett., 37, L16801. pdf.
Adam O., and N. Paldor, 2010a: Global circulation in an axially symmetric shallow water model forced by off-equatorial differential heating. J. Atmos. Sci., 67, 1275-1286. pdf.
Adam O., and N. Paldor, 2009: Global circulation in an axially symmetric shallow water model forced by equinoctial differential heating. J. Atmos. Sci. 66, 1418-1433. pdf.
For a few years, I was the CTO of Pulmone. We developed a device for measuring lung volumes. Below are patents in the field of lung mechanics.
Lazar A., Gaides M., Rechav. B., Adam O., Sheinman S., and Shiner R.: “System and methods for the measurement of lung volumes”. PCT WO2009013755A2.
O. Adam and A. Lazar: “System and methods for the measurement of lung volumes”. Granted Feb.2014. US Patent 8657757 B2.
O. Adam, A. Lazar, Sheinman Y., Peles Z. and Shiner R: “Methods and apparatus for the measurement of pulmonary parameters.” PCT, WO/2012/004794.
R. Shiner, Adam O., and A. Lazar: Methods and devices for determining pulmonary measurements. PCT, WO/2010/086851.
O. Adam, LaPrad A., Cohen I., and Peles Z.: Determining Respiratory Parameters. PCT US2014/032186.