Photo of Juha Karhu
  • PL 64 (Gustaf Hällströmin katu 2)

    00014

    Finland

1986 …2019
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Publications 1986 2019

2019

Miten kivet syntyvät ja säilyvätkö ne ikuisesti? Lasten tiedekysymykset

Karhu, J. A., 4 Jan 2019, In : Helsingin Sanomat. 1 p.

Research output: Contribution to journalArticleGeneral public

Open Access

Widespread occurrences of variably crystalline C-13-depleted graphitic carbon in banded iron formations

Dodd, M. S., Papineau, D., She, Z-B., Manikyamba, C., Wan, Y-S., O'Neil, J., Karhu, J. A., Rizo, H. & Pirajno, F., 15 Apr 2019, In : Earth and Planetary Science Letters. 512, p. 163-174 12 p.

Research output: Contribution to journalArticleScientificpeer-review

2018

Miksi merivesi ei imeydy merenpohjaan ja häviä? Lasten tiedekysymykset

Karhu, J. A., 17 Aug 2018, In : Helsingin Sanomat. 1 p.

Research output: Contribution to journalArticleGeneral public

Mistä tuli ensimmäinen vesipisara? Lasten tiedekysymykset

Karhu, J. A., 2 Feb 2018, In : Helsingin Sanomat. 2018, 1 p.

Research output: Contribution to journalArticleGeneral public

Onko mahdollista, että maapallolta loppuu tai häviää kaikki vesi? Lasten tiedekysymykset

Karhu, J. A., 8 Jun 2018, In : Helsingin Sanomat. 2018, 1 p.

Research output: Contribution to journalArticleGeneral public

Paljonko maapallo painaa? Lasten tiedekysymykset

Karhu, J., 12 Jan 2018, In : Helsingin Sanomat. 2018, 1 p.

Research output: Contribution to journalArticleGeneral public

2017

Deep Groundwater Evolution at Outokumpu, Eastern Finland: From Meteoric Water to Saline Gas-Rich Fluid

Kietäväinen, R., 31 Mar 2017, Espoo: Geological Survey of Finland. 150 p.

Research output: ThesisDoctoral ThesisCollection of Articles

Open Access

Natural vs. anthropogenic effects in the composition of dissolved inorganic carbon in a boreal river with a seasonal base flow component

Niinikoski, P. I. A. & Karhu, J. A., Dec 2017, In : Hydrology research. 48, 6, p. 1585-1593 9 p.

Research output: Contribution to journalArticleScientificpeer-review

2016

A short-term, post-Lomagundi positive C isotope excursion at c. 2.03 Ga recorded by the Wooly Dolomite, Western Australia

Bekker, A., Krapez, B., Muller, S. G. & Karhu, J. A., Jul 2016, In : Journal of the Geological Society. 173, 4, p. 689-700 12 p.

Research output: Contribution to journalArticleScientificpeer-review

Biogenic processes in crystalline bedrock fractures indicated by carbon isotope signatures of secondary calcite

Sahlstedt, E., Karhu, J. A., Pitkänen, P. & Whitehouse, M., 2016, In : Applied Geochemistry. 67, p. 30-41 12 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File

Geochemical and flow modelling as tools in monitoring managed aquifer recharge

Niinikoski, P., Saraperä, S., Hendriksson, N. & Karhu, J. A., Nov 2016, In : Applied Geochemistry. 74, p. 33-43 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Kumpaa on enemmän, vettä vai maata? Paljonko ero on kiloissa? (Lasten tiedekysymykset)

Karhu, J. A., 11 Mar 2016, In : Helsingin Sanomat. 2016, 1 p.

Research output: Contribution to journalArticleGeneral public

Mistä maapallon vesi on tullut? (Lasten tiedekysymykset)

Karhu, J. A., 14 Oct 2016, In : Helsingin Sanomat. 2016

Research output: Contribution to journalArticleGeneral public

Using stable isotopes to resolve transit times and travel routes of river water: a case study from southern Finland

Niinikoski, P. I. A., Hendriksson, N. M. & Karhu, J. A., Aug 2016, In : Isotopes in Environmental and Health Studies. 52, 4-5, p. 380-392 13 p.

Research output: Contribution to journalArticleScientificpeer-review

2015

Miksi Saharassa on ennen kaikkea hiekkaa?

Karhu, J. A., 2015, Ovatko kaikki esineet joskus olleet märkiä? : ja 127 muuta kiperää kysymystä, joihin saadaan viisas vastaus. Kaseva, T., Kauppinen, T. & Merimaa, J. (eds.). Porvoo: HS Kirjat, p. 97 1 p.

Research output: Chapter in Book/Report/Conference proceedingChapterGeneral public

Miten timantit syntyvät?

Karhu, J. A., 4 Sep 2015, In : Helsingin Sanomat. 2015, 1 p.

Research output: Contribution to journalArticleGeneral public

2014

18O, 2H and 3H Isotopic Composition of Precipitation and Shallow Groundwater in Olkiluoto

Hendriksson, N., Karhu, J. & Niinikoski, P., Dec 2014, Posiva. 39 p. (Posiva Working Reports; no. 2014-69)

Research output: Book/ReportCommissioned reportProfessional

A study of the stable carbon and oxygen isotope composition of recent shells of Mytilidae, especially of oxygen values in relation to temperature

Donner, J., Sonninen, E., Karhu, J. & Kotilainen, A., 2014, In : Bulletin of the Geological Society of Finland . 86, p. 61-70 10 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File

Echoes from the Past: A Healthy Baltic Sea Requires More Effort

Kotilainen, A. T., Arppe, L., Dobosz, S., Jansen, E., Kabel, K., Karhu, J., Kotilainen, M. M., Kuijpers, A., Lougheed, B. C., Meier, H. E. M., Moros, M., Neumann, T., Porsche, C., Poulsen, N., Rasmussen, P., Ribeiro, S., Risebrobakken, B., Ryabchuk, D., Schimanke, S., Snowball, I. & 5 othersSpiridonov, M., Virtasalo, J. J., Weckstrom, K., Witkowski, A. & Zhamoida, V., 2014, In : Ambio. 43, 1, p. 60-68 9 p.

Research output: Contribution to journalArticleScientificpeer-review

Evolution of Olkiluoto Site: Paleohydrogeochemical Considerations

Smellie, J., Eichinger, F., Waber, N., Koskinen, L., Sahlstedt, E., Karhu, J., Pitkänen, P., Siitari-Kauppi, M. K., Aaltonen, I., Löfman, J. & Poteri, A., May 2014, Olkiluoto: Posiva. 228 p. (Posiva Working Report; no. 2014-27)

Research output: Book/ReportCommissioned reportProfessional

Fracture mineral study of the hydraulic feature HZ20 and implications to paleohydrogeology: a report of investigations in 2009

Sahlstedt, E., Karhu, J. & Rinne, K., 2014, Posiva. 114 p. (Posiva Working Reports; vol. 2012, no. 93)

Research output: Book/ReportCommissioned reportProfessional

Lasten tiedekysymykset: Montako kertaa aallon pitää pyyhkäistä kalliota, että se häviää kokonaan?

Karhu, J., 12 May 2014, In : Helsingin Sanomat. 1 p.

Research output: Contribution to journalArticleGeneral public

Lasten tiedekysymykset: Miksi maa halkeilee kuivuudesta?

Karhu, J., 22 Sep 2014, In : Helsingin Sanomat. 2014, p. 29 1 p.

Research output: Contribution to journalArticleGeneral public

Lasten tiedekysymykset: Miten kalliot syntyvät?

Karhu, J., 28 Apr 2014, In : Helsingin Sanomat. 1 p.

Research output: Contribution to journalArticleGeneral public

Lasten tiedekysymykset: Miten metallia valmistetaan?

Karhu, J., 2 Jun 2014, In : Helsingin Sanomat. 1 p.

Research output: Contribution to journalArticleGeneral public

Travertine precipitation in the Paleoproterozoic Kuetsjärvi Sedimentary Formation, Pechenga Greenstone Belt, NE Fennoscandian Shield

Salminen, P. E., Brasier, A. T., Karhu, J. A. & Melezhik, V. A., Dec 2014, In : Precambrian Research. 255, p. 181-201 21 p.

Research output: Contribution to journalArticleScientificpeer-review

2013

Implications of sulfur isotope fractionation in fracture-filling sulfides in crystalline bedrock, Olkiluoto, Finland

Sahlstedt, E., Karhu, J. A., Pitkänen, P. & Whitehouse, M., May 2013, In : Applied Geochemistry. 32, p. 52-69 18 p.

Research output: Contribution to journalArticleScientificpeer-review

Kolosjoki Sedimentary Formation: A record in the aftermath of the Paleoproterozoic global positive delta C-13 excursion in sedimentary carbonates

Salminen, P. E., Karhu, J. A. & Melezhik, V. A., 20 Dec 2013, In : Chemical Geology. 362, p. 165-180 16 p.

Research output: Contribution to journalArticleScientificpeer-review

Paleoproterozoic high delta C-13(carb) marbles from the Ruwenzori Mountains, Uganda: Implications for the age of the Buganda Group

Master, S., Bekker, A. & Karhu, J. A., 20 Dec 2013, In : Chemical Geology. 362, p. 157-164 8 p.

Research output: Contribution to journalArticleScientificpeer-review

Stable isotope and trace element constraints to the origin of carbonate rocks in the Korsnas Pb-REE deposit, Western Finland

Torppa, A. & Karhu, J. A., 2013, Unknown host publication. Jonsson, E. (ed.). p. 1746-1749 4 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Tracking lateral δ13Ccarb variation in the Paleoproterozoic Pechenga Greenstone Belt, the north eastern Fennoscandian Shield

Salminen, P. E., Karhu, J. A. & Melezhik, V. A., May 2013, In : Precambrian Research. 228, p. 177-193 17 p.

Research output: Contribution to journalArticleScientificpeer-review

Vantaanjoen ja sen sivujokien hydrauliset yhteydet pohjavesimuodostumiin ja vaikutukset veden laatuun

Kivimäki, A-L., Rautio, A. B. K., Korkka-Niemi, K. I., Brander, M., Nygård, M., Vahtera, H., Karhu, J. A., Salonen, V-P., Kiirikki, M. & Lahti, K., 2013, Helsinki: Vantaanjoen ja Helsingin seudun vesiensuojeluyhdistys. 133 p. (Vantaanjoen ja Helsingin seudun vesiensuojeluyhdistys / Julkaisu; no. 69)

Research output: Book/ReportCommissioned reportProfessional

2012

Evolution of Earth’s Atmosphere

Karhu, J. A., 2012, From the Earth's Core to Outer Space. Haapala, I. (ed.). Springer-Verlag, Vol. 137. p. 187-197 11 p.

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

Jos Suomesta poraa reiän maapallon läpi, mistä terä tulee ulos?

Karhu, J. A., 20 Mar 2012, In : Helsingin Sanomat. 2012, 1 p.

Research output: Contribution to journalArticleGeneral public

Lasten tiedekysymykset: Mitä on eniten: tähtiä, hiekanjyviä vai lumihiutaleita?

Karhu, J. A., 25 Sep 2012, In : Helsingin Sanomat. 2012

Research output: Contribution to journalArticleGeneral public

Open Access

Miksi Saharassa on ennen kaikkea hiekkaa?

Karhu, J. A., 29 May 2012, In : Helsingin Sanomat. 2012, 1 p.

Research output: Contribution to journalArticleGeneral public

2010

Geotieteet uudistuvat Kumpulan tiedekampuksella

Karhu, J., Heikkinen, P. & Rämö, T., 2010, In : Materia. 2010 / 68, 5, p. 26-28 3 p.

Research output: Contribution to journalArticleGeneral public

Indications for the past redox environments in deep groundwaters from the isotopic composition of carbon and oxygen in fracture calcite, Olkiluoto, SW Finland

Sahlstedt, E., Karhu, J. A. & Pitkanen, P., 2010, In : Isotopes in Environmental and Health Studies. 46, p. 370-391 22 p.

Research output: Contribution to journalArticleScientificpeer-review

Insights from isotope stratigraphy

Sial, A. N., Karhu, J. A. & Ferreira, V. P., 2010, In : Precambrian Research. 182, 4, p. V-IX 5 p.

Research output: Contribution to journalReview ArticleScientificpeer-review

Oxygen isotope values of precipitation and the thermal climate in Europe during the middle to late Weichselian ice age

Arppe, L. & Karhu, J. A., 2010, In : Quaternary Science Reviews. 29, 9-10, p. 1263-1275 13 p.

Research output: Contribution to journalArticleScientificpeer-review

2009

Bioapatite Sr-87/Sr-86 of the last woolly mammoths-Implications for the isolation of Wrangel Island

Arppe, L., Karhu, J. A. & Vartanyan, S. L., 2009, In : Geology. 37, p. 347-350 4 p.

Research output: Contribution to journalArticleScientificpeer-review

Geochemical and isotopic evolution of high-pH groundwater in a carbonate-bearing glacigenic aquifer, SW Finland

Kortelainen, N. M. & Karhu, J. A., 2009, In : Hydrology research. 40, 1, p. 19-31 13 p.

Research output: Contribution to journalArticleScientificpeer-review

INFLOW cruise report: SEDU 2009, the RV Aranda 22.-29.4.2009

Kotilainen, A., Ryabchuk, D., Kotilainen, M. M., Arppe, L., Dobosz, S., Hämäläinen, J. & Karhu, J., 2009, Espoo: GTK. 19 p. (INFLOW Interim Report; no. 1)

Research output: Book/ReportCommissioned reportProfessional

Paleohydrogeological implications from fracture calcites and sulfides in a major hydrogeological zone HZ19 at Olkiluoto

Sahlstedt, E., Rinne, K. & Karhu, J., 2009, Helsinki: Posiva. 85 p. (Posiva : Working report / Posiva Oy; no. 2009-54)

Research output: Book/ReportCommissioned reportProfessional

2008

Collection of radiocarbon dates on the mammoths (Mammuthus primigenius) and other genera of Wrangel Island, northeast Siberia, Russia

Vartanyan, S. L., Arslanov, K. A., Karhu, J. A., Possnert, G. & Sulerzhitsky, L. D., 2008, In : Quaternary Research. 70, 1, p. 51-59 9 p.

Research output: Contribution to journalArticleScientificpeer-review

Geotieteellisiä tutkimusmatkoja sadan vuoden ajalta

Karhu, J., 2008, In : Tieteessä tapahtuu. 2008, 5, p. 29-30

Research output: Contribution to journalArticleGeneral public

2007

Ancient subduction recorded in the isotope characteristics of similar to 1.8 Ga Fennoscandian carbonatites

Torppa, O. A. & Karhu, J. A., Aug 2007, In : Geochimica et Cosmochimica Acta. 71, 15, p. A1032-A1032 1 p.

Research output: Contribution to journalConference articleScientific

GEONET: Geoalan opetus- ja tutkimusyhteistyö tiivistyy

Loukola-Ruskeeniemi, K., Ehlers, C., Gehör, S., Hanski, E., Karhu, J., Nenonen, K., Nurmi, P., Peltoniemi, M., Peuraniemi, V., Räsänen, M. & Salonen, V-P., 2007, In : Geologi. 59, 2, p. 49 1 p.

Research output: Contribution to journalArticleProfessional

MIS 3 mammoth remains from Sweden - implications for faunal history, palaeoclimate and glaciation chronology

Ukkonen, P., Arppe, L., Houmark-Nielsen, M., Kjaer, K. H. & Karhu, J. A., 2007, In : Quaternary Science Reviews. 26, 25-28, p. 3081-3098 18 p.

Research output: Contribution to journalArticleScientificpeer-review

Neoproterozoic-Cambrian climate changes and Southernmost Brazil.

Eerola, T., Mänttäri, I., Pesonen, L., Salminen, J., Uutela, A., Borba, A. W., Saalmann, K., Hartmann, L. A., Remus, M. V. D. & Karhu, J., 2007, Geologian 5. tutkijapäivät 6.-8.3.2007: ohjelma ja esitysten tiivistelmät. Kultti, S., Kakkinen, A., Salonen, V-P. & Rämö, T. (eds.). p. 22-24 3 p. (Publications of the Department of Geology. A; no. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific