Search Results - (Author, Cooperation:M. Heimann)
-
1Latest Papers from Table of Contents or Articles in PressM. Forkel ; N. Carvalhais ; C. Rodenbeck ; R. Keeling ; M. Heimann ; K. Thonicke ; S. Zaehle ; M. Reichstein
American Association for the Advancement of Science (AAAS)
Published 2016Staff ViewPublication Date: 2016-01-23Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Atmosphere ; *Carbon Cycle ; Carbon Dioxide/*metabolism ; *Climate Change ; Ecosystem ; Environmental Monitoring ; Photosynthesis ; Plants/*metabolism ; SeasonsPublished by: -
2Latest Papers from Table of Contents or Articles in PressS. Houweling ; B. Badawy ; D. F. Baker ; S. Basu ; D. Belikov ; P. Bergamaschi ; P. Bousquet ; G. Broquet ; T. Butler ; J. G. Canadell ; J. Chen ; F. Chevallier ; P. Ciais ; G. J. Collatz ; S. Denning ; R. Engelen ; I. G. Enting ; M. L. Fischer ; A. Fraser ; C. Gerbig ; M. Gloor ; A. R. Jacobson ; D. B. Jones ; M. Heimann ; A. Khalil ; T. Kaminski ; P. S. Kasibhatla ; N. Y. Krakauer ; M. Krol ; T. Maki ; S. Maksyutov ; A. Manning ; A. Meesters ; J. B. Miller ; P. I. Palmer ; P. Patra ; W. Peters ; P. Peylin ; Z. Poussi ; M. J. Prather ; J. T. Randerson ; T. Rockmann ; C. Rodenbeck ; J. L. Sarmiento ; D. S. Schimel ; M. Scholze ; A. Schuh ; P. Suntharalingam ; T. Takahashi ; J. Turnbull ; L. Yurganov ; A. Vermeulen
American Association for the Advancement of Science (AAAS)
Published 2012Staff ViewPublication Date: 2012-09-01Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Atmosphere/*chemistry ; Carbon Dioxide/*analysis ; *Climate ChangePublished by: -
3Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2011-08-13Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Agriculture/history/*statistics & numerical data ; Animals ; Antarctic Regions ; Atmosphere/*chemistry ; Biomass ; China ; Ethane/analysis ; Fires ; Fossil Fuels/history/*utilization ; Greenland ; History, 20th Century ; History, 21st Century ; Methane/*analysis/metabolism ; Microbial Consortia/physiology ; Oryza/metabolismPublished by: -
4Latest Papers from Table of Contents or Articles in PressX. Wang ; S. Piao ; P. Ciais ; P. Friedlingstein ; R. B. Myneni ; P. Cox ; M. Heimann ; J. Miller ; S. Peng ; T. Wang ; H. Yang ; A. Chen
Nature Publishing Group (NPG)
Published 2014Staff ViewPublication Date: 2014-01-28Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Antarctic Regions ; Atmosphere/chemistry ; Carbon/analysis/metabolism ; Carbon Cycle/*physiology ; Carbon Dioxide/metabolism ; Carbon Sequestration ; Droughts ; Ecosystem ; Global Warming ; Hawaii ; History, 20th Century ; History, 21st Century ; Humidity ; Models, Theoretical ; Rain ; *Temperature ; *Tropical ClimatePublished by: -
5Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2013-08-30Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; *Freezing ; *Global Warming ; Humans ; Methane/*adverse effects/*analysis ; *Models, EconomicPublished by: -
6Articles: DFG German National LicensesRaupach, M. R. ; Rayner, P. J. ; Barrett, D. J. ; DeFries, R. S. ; Heimann, M. ; Ojima, D. S. ; Quegan, S. ; Schmullius, C. C.
Oxford, UK : Blackwell Science Ltd
Published 2005Staff ViewISSN: 1365-2486Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: BiologyEnergy, Environment Protection, Nuclear Power EngineeringGeographyNotes: Systematic, operational, long-term observations of the terrestrial carbon cycle (including its interactions with water, energy and nutrient cycles and ecosystem dynamics) are important for the prediction and management of climate, water resources, food resources, biodiversity and desertification. To contribute to these goals, a terrestrial carbon observing system requires the synthesis of several kinds of observation into terrestrial biosphere models encompassing the coupled cycles of carbon, water, energy and nutrients. Relevant observations include atmospheric composition (concentrations of CO2 and other gases); remote sensing; flux and process measurements from intensive study sites; in situ vegetation and soil monitoring; weather, climate and hydrological data; and contemporary and historical data on land use, land use change and disturbance (grazing, harvest, clearing, fire).A review of model–data synthesis tools for terrestrial carbon observation identifies ‘nonsequential’ and ‘sequential’ approaches as major categories, differing according to whether data are treated all at once or sequentially. The structure underlying both approaches is reviewed, highlighting several basic commonalities in formalism and data requirements.An essential commonality is that for all model–data synthesis problems, both nonsequential and sequential, data uncertainties are as important as data values themselves and have a comparable role in determining the outcome.Given the importance of data uncertainties, there is an urgent need for soundly based uncertainty characterizations for the main kinds of data used in terrestrial carbon observation. The first requirement is a specification of the main properties of the error covariance matrix.As a step towards this goal, semi-quantitative estimates are made of the main properties of the error covariance matrix for four kinds of data essential for terrestrial carbon observation: remote sensing of land surface properties, atmospheric composition measurements, direct flux measurements, and measurements of carbon stores.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesNemry, B. ; Fran&ccedilOis, L. ; Gérard, J. -C. ; Bondeau, A. ; Heimann, M. ; Intercomparison, ThE. Participants OF. ThE. Potsdam NpP. Model
Oxford, UK : Blackwell Science Ltd
Published 1999Staff ViewISSN: 1365-2486Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: BiologyEnergy, Environment Protection, Nuclear Power EngineeringGeographyNotes: Eight terrestrial biospheric models (TBMs) calculating the monthly distributions of both net primary productivity (NPP) and soil heterotrophic respiration (RH) in the Potsdam NPP Model Intercomparison workshop are used to simulate seasonal patterns of atmospheric CO2 concentration. For each model, we used net ecosystem productivity (NEP = NPP – RH) as the source function in the TM2 atmospheric transport model from the Max-Planck Institute for Meteorology. Comparing the simulated concentration fields with detrended measurements from 25 monitoring stations spread over the world, we found that the decreasing seasonal amplitude from north to south is rather well reproduced by all the models, though the amplitudes are slightly too low in the north. The agreement between the simulated and observed seasonality is good in the northern hemisphere, but poor in the southern hemisphere, even when the ocean is accounted for. Based on a Fourier analysis of the calculated zonal atmospheric signals, tropical NEP plays a key role in the seasonal cycle of the atmospheric CO2 in the whole southern hemisphere. The relatively poor match between measured and predicted atmospheric CO2 in this hemisphere suggests problems with all the models. The simulation of water relations, a dominant regulator of NEP in the tropics, is a leading candidate for the source of these problems.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesHouse, J. I. ; Hibbard, K. A. ; Bousquet, P. ; Ciais, P. ; Peylin, P. ; Braswell, B. H. ; Apps, M. J. ; Baker, D. ; Bondeau, A. ; Canadell, J. ; Churkina, G. ; Cramer, W. ; Denning, A. S. ; Field, C. B. ; Friedlingstein, P. ; Goodale, C. ; Heimann, M. ; Houghton, R. A. ; Melillo, J. M. ; Moore, B. ; Murdiyarso, D. ; Noble, I. ; Pacala, S. W. ; Prentice, I. C. ; Raupach, M. R.
[s.l.] : Macmillian Magazines Ltd.
Published 2001Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Knowledge of carbon exchange between the atmosphere, land and the oceans is important, given that the terrestrial and marine environments are currently absorbing about half of the carbon dioxide that is emitted by fossil-fuel combustion. This carbon uptake is therefore limiting the extent of ...Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 0304-3800Keywords: Atmospheric CO"2 ; Carbon dynamics ; Climate ; ValidationSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyType of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1432-1440Source: Springer Online Journal Archives 1860-2000Topics: MedicineNotes: Zusammenfassung Es wurde imSerum von Normalen und Geisteskranken das Abbauvermögen gegenüber Gehirnlipoiden in der Weise untersucht, daß der anorganische Phosphatgehalt eines Gemisches von Serum+Gehirnlipoid sofort und nach 24stündigem Aufenthalt im Brutschrank bestimmt wurde. Diese Untersuchung ergab bei Normalen eine Zunahme des anorganischen Phosphors von 0,1–0,95 mg%, im Mittel 0,38 mg%; bei P. p., Epilepsie, Paranoia und Schizophrenie wurden in etwa 60–66% der Fälle gegenüber dem höchsten bei Normalen gefundenem Wert ein erhöhtes Abbauvermögen für Gehirnlipoide gefunden. Die Mittelwerte dieser Krankheitsgruppen waren gegenüber dem bei Normalen gefundenen Mittelwert um etwa 350% erhöht. Diese Untersuchungen sollen in bezug auf das Auf- und Abbauvermögen des Serums und der Organe gegenüber den einzelnen Lipoiden bei verschiedenen Erkrankungen ausgedehnt werden, weil die Untersuchung dieser Vorgänge eine erweiterte Basis für diagnostische und therapeutische Bestrebungen abgeben könnte.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 0163-6383Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PsychologyType of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 0163-6383Keywords: gaze aversion ; imitation ; mother-infant interaction ; neonatesSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PsychologyType of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1432-0894Source: Springer Online Journal Archives 1860-2000Topics: GeosciencesPhysicsNotes: Abstract Deep rooted vegetation (of up to 68 m) has been found in many parts of the tropics. However, models of the general atmospheric circulation (GCMs) typically use rooting depths of less than 2 m in their land surface parametrizations. How does the incorporation of deep roots into such a model affect the simulated climate? We assess this question by using a GCM and find that deeper roots lead to a pronounced seasonal response. During the dry season, evapotranspiration and the associated latent heat flux are considerably increased over large regions leading to a cooling of up to 8 K. The enhanced atmospheric moisture is transported towards the main convection areas in the inner tropical convergence zone where it supplies more energy to convection thus intensifying the tropical circulation patterns. Comparison to different kinds of data reveals that the simulation with deeper roots is much closer to observations. The inclusion of deep roots also leads to a general increased climatic sensitivity to rooting depth change. We investigate this aspect in the context of the climatic effects of large-scale deforestation in Amazonia. Most of the regional and remote changes can be attributed to the removal of deep roots. We conclude that deep rooted vegetation is an important part of the tropical climate system. Without the consideration of deep roots, the present-day surface climate cannot adequately be simulated.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 1432-8798Source: Springer Online Journal Archives 1860-2000Topics: MedicineNotes: Summary Cell transformation is characterized by overt changes in growth control and cell morphology. To study the role of tyrosine residues Y705 and Y807 of v-Fms of the McDonough strain of feline sarcoma virus in cell transformation we replaced them individually with phenylalanine residues. Cells expressing the mutant genes showed mitogenic properties similar to wild-type v-Fms transformed cells. However, the morphology of cells expressing the Y807F mutant remained the same as nontransformed cells. Four phosphoproteins of 190, 120, 55 and 50 kDa were detected in cells expressing the wild-type but were absent in cells expressing the mutant Y807F-v-fms gene.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesMcGuire, A.D. ; Melillo, J.M. ; Randerson, J.T. ; Parton, W.J. ; Heimann, M. ; Meier, R.A. ; Clein, J.S. ; Kicklighter, D.W. ; Sauf, W.
Springer
Published 2000Staff ViewISSN: 1573-515XKeywords: carbon dioxide ; ecological modeling ; global carbon cycle ; heterotrophic respiration ; net ecosystem productionSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyGeosciencesNotes: Abstract Simulations by global terrestrial biogeochemical models (TBMs) consistently underestimate the concentration of atmospheric carbon dioxide (CO2 at high latitude monitoring stations during the non-growing season. We hypothesized that heterotrophic respiration is underestimated during the nongrowing season primarily because TBMs do not generally consider the insulative effects of snowpack on soil temperature. To evaluate this hypothesis, we compared the performance of baseline and modified versions of three TBMs in simulating the seasonal cycle of atmospheric CO2 at high latitude CO2 monitoring stations; the modified version maintained soil temperature at 0 °C when modeled snowpack was present. The three TBMs include the Carnegie-Ames-Stanford Approach (CASA), Century, and the Terrestrial Ecosystem Model (TEM). In comparison with the baseline simulation of each model, the snowpack simulations caused higher releases of CO2 between November and March and greater uptake of CO2 between June and August for latitudes north of 30° N. We coupled the monthly estimates of CO2 exchange, the seasonal carbon dioxide flux fields generated by the HAMOCC3 seasonal ocean carbon cycle model, and fossil fuel source fields derived from standard sources to the three-dimensional atmospheric transport model TM2 forced by observed winds to simulate the seasonal cycle of atmospheric CO2 at each of seven high latitude monitoring stations. In comparison to the CO2 concentrations simulated with the baseline fluxes of each TBM, concentrations simulated using the snowpack fluxes are generally in better agreement with observed concentrations between August and March at each of the monitoring stations. Thus, representation of the insulative effects of snowpack in TBMs generally improves simulation of atmospheric CO2 concentrations in high latitudes during both the late growing season and nongrowing season. These simulations highlight the global importance of biogeochemical processes during the nongrowing season in estimating carbon balance of ecosystems in northern high and temperate latitudes.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 1618-2650Keywords: Bestimmung von Sauerstoff-18 in Carotinoiden ; Massenspektrometrie, ProtonenaktivierungsanalyseSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyDescription / Table of Contents: Zusammenfassung Methodik, Anwendungsbereich und mögliche Fehlerquellen bei der quantitativen 18O-Analyse von markierten Carotinoiden werden diskutiert für a) Protonenaktivierungsanalyse, b) Massenspektroskopische Analyse von pyrolytisch erhaltenem CO2, c) direkte massenspektroskopische Bestimmung der SignalverhÄltnisse [P + 2]∶[P] charakteristischer Ionen unter Niedrig- und Hochauflösungsbedingungen.Notes: Summary Methodology, applicability and possible sources of error are discussed for the quantitative 18O analysis in labelled carotinoids using a) proton activation analysis, b) mass spectrometric analysis of CO2 obtained by pyrolysis, c) direct mass spectrometric determination of the signal ratios [P + 2]∶[P] of characteristic ions (low and high resolution).Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesStaff View
ISSN: 0365-9496Keywords: Chemistry ; Inorganic ChemistrySource: Wiley InterScience Backfile Collection 1832-2000Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL:
